Historical sewing requires experience & knowledge of the era, this pattern is great for beginners to learn and for advanced sewists too. It's easy to tailor to any shape, I use it for long & short men's waistcoats, I even modified it for a sailor's jacket, tailored to my feminine figure.
**Pro Tip**
The JP Ryan Frock-/Gentleman's coat patters (also recommended) are designed for an 18th century posture: standing straight & tall with shoulders back <=> narrow shoulder, long straight spine. If you tailor a sleeveless waistcoat to a modern posture -wide, rounded shoulders- then it won't fit correctly under a historically accurate coat. For suit sets, discuss posture/historical fit with the wearer.