Id still by quality stuff, buying a z-suit and a blast shirt is not going to help anything
looser fitting / less aggressive designs are ideal I think. touching weights and getting squat depth is almost all in the head and a little technique. Yes, there is ballparks, but even so a 225lbs raw bench couild probally handle a medium fitting titan f6 which is a quality shirt. I imagine with some heavy board work + learning the shirt you would be at 300lbs pretty quick.