SIZING:
Jacket size equals chest measurement of the jacket itself, this is NOT
your measurement. For example, a size 48 jacket means that the jacket
measures approximately 48 inches in the chest.
Measure
the largest part of your chest (while wearing the type of clothing you
would normally wear under your jacket), take that measurement and add
2-3 inches to it. For example, if your chest measurement is 48 inches,
order a size 50. If your chest measures 49 inches, order a size 52.
If your waist or stomach measurement is larger than your chest measurement then use that measurement and add 2-3 inches and choose your size that way.
Better to give yourself a little extra room than to order a jacket that is too small for you.