Originally Posted by amgwhip123
generally, when buying pea coats, regardless of the brand, do I buy a coat with the same chest measurement as my suit jackets, or do I size up?
for example, if i wear my chest measures to 38, and i wear 38 jacket across the board, do I size up to a 40 when I buy a pea coat? considering I will wear a thick sweater or light jacket underneath?
There are 338 pages discussing this very question. The sizing of peacoats is as varied as the number of manufacturers that make pea coats. Many manufacturers make their peacoats over sized, so there is a need to size down. Some make theirs way oversize, so there is a need to size down two or more sizes. I haven't come across any peacoats that should be sized up. A reading of these pages will give a general idea of which company does what with sizing.
Generally, there are two ways to wear a peacoat: with a sweater worn underneath and without any layering. Those in colder climates usually find that a sweater adds insulation and warmth to a peacoat. Those in more temperate climates who experience temperatures mostly above freezing, or maybe a little below, find that a fit closer to the body eliminates the need for layering. It depends on the individual. For example, tomorrow in my area the high is forecast to be 34 with a low of 20. That means when I leave for work, the temp will be 20. I will wear a size 40 vintage peacoat with no layering (my chest size is 42). If the low were in the teens, high in the 20s, I probably would wear a size 42 peacoat with a sweater.
For specific information for sizing, see the guide linked below in my signature line. The information on sizing is toward the end, and is applicable to all brands of heavy wool pea coats. If, after reading the sizing information, you still have questions, come back here and someone will attempt to answer them.