Groom is in the Heart   The Unstuffy, Unfussy Guide to Going Formal   This Tux Is $360 (And You Still Want to Rent?)   Your Can't-Miss Tux Checklist  This ain't your poppa's fusty old tux. You want it tailored as meticulously slim as your favorite suits.Go for either a tux shirt that doesn't require jewelry or a semispread-collar dress shirt with French cuffs.Yeah, clip-on bow ties are cool again. But as of today, you're a grown-ass man, and you should be able to tie your own.It might sound nitpicky, but to keep everything in proportion, your boutonniere should be as small as your lapels are slim. (Yes, really.)Echo that crisp white shirt with a crisp white pocket square.Tudo, $360 by Topman. Shirt, $115 by John Varvatos USA. Bow tie, $80 by J.Lindeberg. Pocket square by Brooks Brothers. Watch by Jaeger-LeCoultre.