tee

https://www.shopify.com/blog/14515425-how-to-start-an-online-t-shirt-business-the-ultimate-guide

Design

https://www.skillshare.com/classes/Hey-Cool-Shirt-Designing-Effective-T-shirt-Graphics/894363116?via=search by Chris Delorenzo, Lead Designer for Johnny Cupcakes.

The Staples of Branding: Building a Company from Purpose to Product

https://www.skillshare.com/classes/The-Staples-of-Branding-Building-a-Company-from-Purpose-to-Product/915436837?via=search

http://www.t-shirtmagazineonline.com/

Research

• Teeview
• Zazzle Bestsellers & Zazzle Popular
• Redbubble Popular
• Skreened Trending Shirts
• Snorg Bestsellers
• Kickstarter T-Shirt Campaigns

Check out t-shirt graphic marketplaces like:

• Designious
• T-Shirt Factory

You may also want to check out general graphic design marketplaces but keep in mind if you plan to sell your t-shirts, you’ll need to purchase a commercial license.

• Creative Market
• Graphic River

Mockups

• Shopify's Free T-Shirt Mockup Generator
• Shirt Mockup (Web Based T-Shirt Mockup)

crowdfund

Example: Dev Tee’s and Starstuff Clothing

Check out the following Shopify printer/dropshipper apps:

• Print Aura
• Printful
• Teelaunch
• Printify
• Merchify