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Thanks all for your thoughts. The jacket is new and snug, not tight. I'm going to get it very wet, and then pull on it and stuff it with towels. I may do that a couple of times and see what happens. Mike
If the jacket is small enough that it needs to be larger to fit better, going up a size is the only option.
I've used this option so many times I'm running out of sizes.Maybe I'll have to switch to Harley leathers.