In my experience, pearl weave cotton gi jackets and pants usually shrink about 4-5% in the wingspan, pant length, and body length, and about 2-3% in the body width, sleeve width, and pant width, after about 5 washes in cold water and hang dry. If you wash warm and dry in the dryer on warm, you can get them to shrink 1.5x to 2x those percentages - i.e. a whole size down. I have no experience with cotton-poly blends, but my understanding is they tend to shrink less because of the polyester. If you're on the fence - since you can't return these - I recommend going for the larger size, and worst case, you just wash warm or tumble dry warm to shrink it to size. But! I recommend doing that after the 3rd to 5th wash once the shrinkage stops. I'm right between an A2 and an A3, but I have long monkey arms, so I usually just get an A3 and deal with a little bit of bagginess in the body to make sure the sleeve length isn't too short. A2Ls aren't always available and the sizing isn't standard, so I just go with A3.

those are very specific percentages