We ordered L, XL, XXL, XXXL.  The shirts run a little wide in the cut across the chest and the shoulders run a little long too, but if you are a man of size, I'd order up first as a XXL wasn't quite roomy enough for our big guys that usually wear XL or XXL.  I am 40R and this was just a touch baggy for me, I probably would have gone with a medium.  I'd order your size and the size up and return the one that doesn't fit as well.

Shirts looked good and were a good price for our group.  I washed a few of them last night and they held up fine in the permanent press cycle.  A quick run through the dryer and you couldn't see any wrinkles really.  I do think these will start to fall apart after about 10-15 wearings and washings, but for the price, I think they're a good product and returns were super easy.