you don't need to have t-shirts in your domain name. The only time that it really helps is if you are looking for a specific key word. Lets say you want people searching for "bugs bunny t-shirts" to find your website. If your domain name is www.bugs-bunny-tshirts.com it will help you alot. Other than that I dont think it matters. Rodneys, ihateclowns.com doesn't even mention anything about t-shirts, and he sell lots of shirts.
A forum community dedicated to T-shirt merchants, professionals and enthusiasts. Come join the discussion about graphics, commerce, dyes, prints, collections, guides, displays, styles, scales, equipment, accessories, reviews, classifieds, and more!