Catalogs
These have almost any apparel item you might want decorated.
San Mar
https://www.sanmar.com/
SS Activewear
https://www.ssactivewear.com/
Badger/Donnie Allison
https://www.foundersport.com/
Augusta/Holloway/High 5/Pacific Headwear/Russell
https://www.augustasportswear.com/
Pennant Sportswear
https://www.pennantsportswear.com/
Promotional Product Catalogs
Koozie Group
https://www.kooziegroup.com/US/search
Gold Bond