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Shopify Plus Partner · Apparel, activewear & golf brands

The Shopify agency for apparel, activewear and golf brands

DesignDevelopmentCROGrowthEmail & SMS · Klaviyo

Fashion ecommerce that sells the fit, not just the photo: Shopify design and development, CRO, growth marketing and Klaviyo email & SMS for apparel brands — built for variant-heavy catalogs, drops, exchanges and wholesale.

Results, not renders

Numbers from apparel brands we’ve redesigned and grown

All case studies →
+45%
Conversion rate within 2 months
Renegade Running · redesign
+28%
Returning customer rate
Renegade Running · community storytelling
+7%
Conversion with new PDP swatches
Criquet Shirts · A/B tested
+42%
Site speed
Criquet Shirts · re-theme
Brands we've pushed

Built for brands where fit, fabric and feel sell the product

Criquet Shirts on Shopify
01

Criquet Shirts

Organic cotton golf & lifestyle · since 2021

A long-term partnership built on experimentation: every UX change, navigation update and feature A/B tested. We re-themed the store, rebuilt navigation and built custom components like Quick Add and collection templates — tying each improvement to measurable growth.

+7%Conversion · PDP swatches
+42%Site speed
+4%Average order value
Read the Criquet case study →
Criquet · PDP & Quick Add on Shopify
02

Criquet · PDP & Quick Add

Variant-heavy merchandising

Swatches on the product page, Quick Add from collections and a cleaner cart — the small, tested changes that make browsing many colors and sizes effortless on mobile.

SwatchesOn the PDP
Quick AddFrom collections
+7%Gross sales
See what we tested →
Galway Bay Golf on Shopify
03

Galway Bay Golf

Technical golf apparel

Technical golf apparel sold on performance and offers that build the outfit: 30K waterproof / 30K breathable, fully seam-sealed fabrics explained right on the page, a pant-plus-free-gift bundle (choose 1 of 14), free U.S. shipping thresholds and rewards.

30KWaterproof / breathable
BundleGift with purchase
RewardsLoyalty program
Visit galwaybaygolf.com ↗
Renegade Running on Shopify
04

Renegade Running

Running apparel & footwear · Oakland & LA

A bold Shopify redesign for a community-driven run shop with stores in Oakland and Los Angeles: a custom modular theme, a blog for community storytelling, and refined UX and navigation across a growing multi-brand catalog.

+45%Conversion rate
+23%Online sales
+28%Returning customers
Read the Renegade case study →
What we do

One team for the whole apparel growth stack

Design, Shopify development, conversion rate optimization, growth marketing and lifecycle email & SMS — under one roof, so collections, product pages, drops and follow-up all work together.

01

Design

Apparel website design

Editorial, mobile-first design that tells the fabric and fit story — lookbooks, campaign landing pages and PDPs that make people feel the product through a screen.

  • Apparel website design & redesigns
  • Lookbooks & campaign pages
  • PDP fabric & fit storytelling
  • Collection & PLP design
  • Size guides & fit finders
  • Design systems for seasonal launches
02

Development

Shopify & Shopify Plus

Fast Shopify Plus builds for catalogs with thousands of variants — swatches, combined listings, filtering and the integrations that keep inventory honest.

  • Custom Shopify themes
  • Swatches & combined listings
  • Filtering, search & sorting
  • Quick Add & cart drawers
  • B2B & wholesale on Shopify Plus
  • ERP & inventory integrations
03

CRO

Fashion CRO

Most apparel friction lives in browsing and fit. We test collection pages, swatches, size guidance and checkout — one variable at a time — and keep what wins.

  • A/B testing program
  • Heatmaps & session recordings
  • PLP & PDP experiments
  • Fit & size guidance tests
  • Mobile add-to-cart & checkout
  • Analytics & attribution setup
04

Growth

Growth & marketing

Drops, collaborations and community — we build the launch and content engine that turns attention into sell-through.

  • Drop & launch playbooks
  • Fashion SEO & content
  • Landing pages for paid social
  • Reviews & UGC with fit data
  • Loyalty & referral
  • Marketplace vs DTC strategy
05

Lifecycle

Email & SMS with Klaviyo

Apparel retention runs on newness and fit confidence: back-in-stock, early access and post-purchase flows that turn one order into a wardrobe.

  • Klaviyo setup & audits
  • Back-in-stock & low-inventory flows
  • Browse & cart abandonment
  • Post-purchase fit check-ins
  • VIP early access & drops
  • SMS programs
Why apparel ecommerce is different

Generic Shopify playbooks miss what apparel shoppers need

Clothing is the most-returned category online — 25% of U.S. online shoppers returned clothing in the past year, more than any other category, and fit is the number-one reason. The store has to sell the fit, not just the photo.

01

Fit drives returns

Shoppers bracket sizes when they’re unsure, and every refund erases a sale.

→ Fit & size guidance on the PDP, review-based fit data, exchange-first returns
02

Variant explosion

Size × color × fit turns one style into dozens of SKUs that are hard to browse.

→ Swatches, combined listings & clean variant architecture
03

Merchandising makes the collection

A great range buried under a flat grid doesn’t sell.

→ Filters by size in stock, sort rules, shop-the-look
04

Selling fabric and feel

Technical fabrics and premium materials are invisible in a product photo.

→ Editorial lookbooks & fabric-tech modules on the PDP
05

Drops & seasonal spikes

Launch days bring traffic surges and sell-outs.

→ Lean, fast themes plus Klaviyo & SMS early-access playbooks
06

Mobile-first discovery

Most shoppers arrive from social on a phone.

→ Mobile PLP/PDP testing, sticky add-to-cart, quick-add sizes
We build with KlaviyoLoopOkendoYotpoRebuyNostoKlevu
How we start

From audit to compounding growth

Book the free audit →
01

Free store audit

We review your collections, PDPs, size guidance, returns flow, speed and email program and show you where revenue is leaking.

Week 1
02

Roadmap

A prioritized plan — quick wins first, bigger builds sequenced by impact, effort and your launch calendar.

Week 2
03

Design & build

Conversion-first design and Shopify development, shipped in focused sprints.

Sprints
04

Test & grow

A/B tests, Klaviyo flows and campaigns, and monthly reporting — so every improvement compounds.

Ongoing
FAQ

Questions apparel founders ask us

Don't see yours? Ask us directly — we reply within one business day.

What makes NINE15 a good Shopify agency for apparel brands?

We combine design, Shopify Plus development, CRO and Klaviyo lifecycle under one team and work with apparel brands like Criquet Shirts, Galway Bay Golf and Renegade Running — where a redesign lifted conversion 45% in two months.

Is Shopify Plus worth it for a fashion brand?

It earns its cost once drops, wholesale/B2B, international markets or checkout customization matter. Below that, standard Shopify with the right apps is often enough — we’ll tell you which side of the line you’re on.

How do you reduce apparel returns online?

By helping shoppers choose the right size the first time — fit guidance on the PDP and review-based fit data — and by making exchanges easier than refunds with tools like Loop, so more returns stay as revenue.

Can our Shopify store handle a product drop?

Shopify scales the infrastructure; we handle the rest — a fast, lean theme, waitlists and Klaviyo/SMS early access, inventory limits and a launch-day checklist.

How do you handle large catalogs with many sizes and colors?

Swatches and combined listings, metafield-driven fit and fabric details, and filtering by size and color in stock, so shoppers only see what they can actually buy.

Can we run wholesale and DTC from one store?

Yes. Shopify Plus B2B handles company accounts, price lists and net terms alongside your DTC storefront — one catalog and one inventory.

Which Klaviyo flows matter most for fashion brands?

Back-in-stock, browse and cart abandonment, post-purchase fit check-ins, replenishment for basics, and VIP early access for new collections and drops.

What does working with you cost, and how do we start?

Every engagement starts with a free store audit. From there we scope a project (new site, migration or redesign) or a monthly retainer for ongoing CRO, development and Klaviyo — based on what will actually move revenue for your brand.

Get a free store audit

Let's grow your apparel brand

Tell us about your brand and store. We'll review it and come back with the three changes we'd make first — whether or not we end up working together.

hello@nine15.com
Who you're talking to

NINE15 — Shopify Plus Partner

Encinitas, California · working with brands across the US

858-775-0221

We'll also send you The NINE15 Letter — unsubscribe anytime.

The NINE15 Letter · Monthly

Playbooks for apparel & fashion brands, not promos

The tests, flows and fixes we run for clients — PDP experiments, drop playbooks, Klaviyo flows — plus first dibs on Commerce Collective invites.