Working drawing of pair of breeches of cut from doe skin. British Napoleonic uniforms.
Drunktailor: Thoughts on late 18th century breeches: how to sew 18th century breeches
DIY man's Regency shirt, although this free pattern can be easily adapted for anything from Renaissance to early Edwardian. YES YES YES
The Art of the Cravat for the Regency Gentleman (by Kristen Koster).
Living with Jane: RHF Regency Men's Waistcoat: Tutorial, Part 1
Pattern for long, narrow-fall breeches. Pattern from Men’s 17th and 18th Century Costume, Cut and Fashion by RI Davis.