For formal occasions like weddings and proms, the well-dressed gentleman's ensemble is not complete without a boutonniere. They're so easy to make, you'll wonder why florists charge so much for them. DIY instructions here: http://www.ehow.com/how_17568_make-boutonniere-wedding.html?utm_source=pinterest.com&utm_medium=referral&utm_content=inline&utm_campaign=fanpage
After years of trial and error, my cabinet contains the Issey Miyake - L'eau D'issey & the YSL - La Nuit De L'Homme. You really should try before you buy, otherwise you're likely to end up spending a fair amount on something unusable.
Being a gentleman aren't just about being polite to women, there are much more things to learn