If you have a 38C bust, unless you like jackets REALLY tight, BUY A LARGE. A medium will fit you, however, it will not be a comfortable fit. I wear a size 8, and on occasion I wear a size 10 top if the item runs small, I say this because unless you have thin arms (not average, and I don't mean the new vanity size of "average" either) a medium size of this jacket will be quite tight in the arm and arm pit areas on you. Because I know sometimes that depending on the color (don't know about this particular item) the sizing is sometimes different, therefore, fyi--I ordered a brown.
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