The Gentleman's Guide to Life: Pocket Edition

We live in a world where the idea of a gentleman is fading away and chivalry is presumed dead. It's essential that as men, and good people, we make an effort to improve ourselves and others.

How can I tell if my suit is a good fit? How do I take care of said suit? Why can shaving brushes cost so much? And how on earth do I mix a Vesper Martini?

Let the guide answer.