Love & Other Things excellent condition probably a medium

I really like this top. and then I turned it around and I loved it. Soft fluffy and 100% Cotton. no snags holes stains or other things the tag for size says F. don't know but let's measure armpit to armpit is 19" so it's wide and boxy. from shoulder to hem is a little over 16" so it's crop top. front armpit to sleeve length is about 16"