ISO: TShirts with NO Side Seams!!

Bunz, I want to make a whole bunch of tshirt yarn for some projects & I need a bunch of TShirts to make this happen!

Any colour, any size - the only requirement is that the shirt have NO seams on the sides! I'd also prefer to avoid shirts that have silkscreen/fabric paint/etc. on them. Coloured/tye dyed fabric is perfectly fine 😆