We haven't done textiles in quite a while but Pinellas County had at least 3 distributors when we did.
GoodBuy on the south side of St. Pete. I think they are now called Alpha shirts
ST. PETERSBURG (ALPHA EXPRESS) 2230-B 31st Street South
Dowling Graphics (mid county) advertises that they are wholesaling shirts.
New to me is a place at: 631 Ridge Road SW, Largo, FL 33770
www.bulkwholesaletshirts.com
Couldn't find some of the ones we used to buy from, sigh.
Bodek and Rhodes has an Orlando office. Ditto for Broder. Both carry an extensive line.
If you go to
http://www.issshows.com/atlantic_city/show/exhibitor-list
and find a brand you like follow the links and most list wholesalers
by state.
Good luck.