Fit is most important for men's formal wear

Proper tailoring for men might be more necessary than it is for women.
ASSOCIATED PRESS
Sure, tuxedos can look great on women, but they still are a menswear item. And often men look their absolute best all dressed up in a black tie and tux.
Sometimes, though, they don't.
Fit is probably the culprit. Proper tailoring on men's clothes might be even more important than it is for women's clothes because there usually aren't any distractions -- no sequins, no splashy prints, no embroidery.
Brioni, the Italian fashion house that put Daniel Craig in his James Bond tuxedo in "Casino Royale," offers tips for men on choosing the perfect tuxedo:
The front of the tuxedo is the first thing you see. So make sure the lapels follow a natural curve instead of an abrupt one. Brioni's tuxedo lapels have 1,000 tiny stitches on the underside to make sure they lie flat and even.
Comfort is almost as important as fit. A tuxedo is a fitted garment that hugs the body; it should be neither loose nor tight.
The button, usually only one, should be at waist level. This emphasizes the shirt and makes the body look slender.
The black tuxedo is a formal dinner suit. In the summer, a tuxedo can be white or off-white. If entertaining at home, a smoking jacket -- which usually is waist-length, made of velvet or silk in deep colors, and has a shawl collar -- can be substituted.