Go look on their japan site - they have exact measurements. Just make sure you are comparing the same product number. From what I've seen in comparing then, you're generally looking at about 1/4" difference in shoulders, 1/2-1" difference in the chest, etc. One odd thing I noticed is it seems that the slim fits actually have longer sleeves. FWIW, I was looking at the linen regular vs. slim shirt and the linen blazer vs slim blazer.