easy peasy backdrop
I used this idea for an ad.
first set up your product
-take a table, place your light box on top or take a peice of white bristol board[tape the bristol board to the wall and table]
-set up your lighting[I use two lights on each side of the table to create minimal shadowing]
-now tape the tshirt to the light box or to the bristol board
-place your product[I always make sure there is no wrinkles]