7.) Dress like Snazzy Claus.
You finally got that obscenely flexible yoga instructor to come to your buddy's swank New Year's Eve bash. So don't dress like a shlub. Try your best suit on immediately — especially since, over the past year, you've added an inch of muscle to your neck, shoulders, and chest. "It's all about the details — a little tweaking can make all the difference," says Marc Piatek, a personal shopper at Barneys New York in Manhattan. "A great suit that doesn't fit is not a great suit."
Game Plan: Figure your tailor will need a week to let out a snug shoulder seam. And if that suit's already seen the ball drop more than a couple of times, "Keep in mind that you cannot remake a suit." Meaning, it's better to purchase something new from the season. (Hint: Piatek says a classic look with an edge — pattern on pattern shirts and ties, luxury fabrics, or vibrant shirt colors — is always right.)
Bonus: As proud as you are of your pecs, the first two things a woman will notice about a man are the fit of his suit, his shoes, and his watch. So polish the former (Stick to a ormal pair of black ones) and wind up the latter (a dressy timepiece, not a cardio-timing compass-master).