How do I know if my bomber jacket is too small?

Im a 6ft-6'1 guy and this jacket was a gift sized Medium. Its a nice looking Calvin Klein piece but I don't know if its too small. The chest area and bicep area feel tight and restricted and gives very little room for movement - arms up, outstretched, reaching for things. The sleeves go slightly past the wrist and shoulder seams are not at the end of my shoulders fully. Not like I can get an exchange its been some time but I've wanted to try wearing it now in the fall, with a fitted hoodie but I don't know if there's even room to pair them. Thank you

How do I know if my bomber jacket is too small?
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