I used to wear an 18th century style waistcoat with some of my business suits. As I am broad-shouldered it kept me warm with out having to keep my jacket on. I hate feeling constricted. I now work in the museum/heritage sector in a medieval building with a Georgian interior. The building is very cool even in summer and cold in the winter. This thread has inspired me to make one to wear on public facing days. So much nicer than fleece jackets.
HettyB