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I don't travel with a suit often, but here's my approach. by circle07
These instructions make it sound more difficult than it really is. The basic gist is that while you're folding the suit you're never folding it with a hard edge — there's always something in between the folds that prevent them from creasing.
Steps:
1) Button up the jacket and lay it flat on your bed, front down.
2) Fold your pants as you normally would, along the pleat, and lay them perpendicular across the top half of your jacket so that the waist runs along the leftmost part of the jacket and the hem is off past the rightmost part of the jacket.
3) Take all your other folded clothes — the ones you don't worry about wrinkling — and stack them in piles on top of the pants, covering the top half the jacket.
4) Pick up your pants by the hem and fold them to the left back over all the clothes you just placed. Tuck any portion of the pants that runs past the leftmost part of the jacket back between your pants and the jacket (the idea being no part of your pants extend beyond the jacket).
5) Fold each of the arms behind the jacket, draping them over your pants-wrapped pile of clothes.
6) Finally, fold the jacket in half by bringing the bottom up over your clothes pile.
This nicely wrapped suit package should fit perfectly in one half of a standard carry-on size roller. Strap it in and you're good to go. Obviously, still take it out as soon as you get to your final destination.