Originally Posted by llltronlll
Can someone help me understand why the large variation? Is it the cut/style of the suit? The "it should cover your butt" rule of thumb doesnt make much sense to me, when I find 40r's with 26" sleeves that only have a 29" jacket length.
Different makers cut different jacket lengths according to current "fashion" trends. That's the difference there.
Alan Flusser has a good diagram that shows proper "Balance", or a guideline for proper jacket length:
The general rule is that you should have equal length from the top of the collar to the bottom of the jacket, as you do bottom of jacket to the floor.
However, "cover your butt" is a decent rule of thumb that ensures that you don't look "out of balance" whereas your jacket is too short and it changes your overall appearance.
Go check out Dressing the Man
, by Alan Flusser for a guide to menswear. It's a bit nit-picky sometimes, but it's a good guide to help you understand why you should try to dress (in some ways) like he recommends.
It's up to you to dress around your body and personality.