As of February 2018 Printify offers the following brands:

Alstyle
Anvil
Awdis
Bella Canvas
Delta
District
Fruit of the loom
Gildan
Hanes
Independent trading company
LAT apparel
Next level
Pacific sports
Rabbit Skins
Sport-tek
Stanley Stella

However, Merchants can easily see the full list at
https://app.printify.com/brands or https://app.printify.com/products 

Use Ctrl (CMD) F to search the page and easily find the brand you're looking for. 

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