Originally Posted by voltronf0rce
I have another question about proper "fits".
I have a 37.5in chest and a 31 waist. What should my suit size be? Should it be 2 inches wider or is it a direct relation? I ask because I want to buy a suit online, but am afraid of buying a size too small or too large. Thanks in advance.
Two inches would be a little too tight. It's safer--for ease of movement, etc.--to allow 3-4". For your measurements, a jacket with 41"-41.5" precise chest measurement, armpit to armpit (that is, with the jacket spread flat, but not stretched and the buttons done up X 2) would be about right. For the jacket waist (measure as above, but at the waist button), a measurement of 35" might be fine, although you won't find a suit jacket having a 41-41.5" chest with that much waist suppression. You might find one with 41" chest/37-38" waist, or in proportion to that ratio. However, if you want, say, another inch of waist suppression, a good tailor can give you that without upsetting the silhouette of the jacket.
All of this means that you need to know a lot
more than the label size. A 38 might give you dimensions about like above, but you really need to ask the seller to take the measurements as noted above, since a labeled 38 could have an actual chest measurement as large as 43" or as little as 39.5". A lot of the better sellers will have these measurements in the listing. Go by the exact measurements, not the stated size on the label.