How to Wear Gentlemanly Underwear, 1891

"White or Pink?"
Gentlemen, 1896

"Underclothing. This consists of shirt, drawers, and half-hose. The material may be flannel, balbriggan, or silk. White is the proper color, because it is pure and clean. Such colors as pink, or blue, or black may be worn. Have the drawers fit tight, or the trousers will set ill... Underclothing should be changed at least twice a day. Silk is worn always with evening dress."  

Mortimer Delano de Lannoy, Simplex Munditiis. Gentlemen (1891)

You can tell a gentleman by his evening drawers. They are silk. They are tight. They may be pink. And they are extremely fresh.

How to Exchange Photographs, 1891

Portrait of an Unknown Daguerrotypist, 1845
J. Paul Getty Museum, Los Angeles

"Photographs should never be solicited from a mere acquaintance. Wait till you know a lady well before asking for her likeness. No gentleman should be allowed to possess, nor should he seek to possess, a lady's picture without first having met her at least seven times... And it is also unnecessary to comply with a like request from the lady till of fast acquaintance."

Mortimer Delano de Lannoy, Simplex Munditiis. Gentlemen (1891)

Best practices for dating: Keep plenty of headshots on hand, but never hand them over before the seventh date.