Small! I just got it for my girlfriend, same cupsize and everything!

I would go for the XS. I'm 5'4 118 lbs & the XS fits me well.

It definitely runs small in the shoulders and sleeves, but other than that it's actually pretty roomy. I think this gives the jacket a nice balance because it's on the "boyfriend blazer" trend but actually looks like it fits. And there are no shoulder pads.

from where it rests on the back of your neck to the bottom its about 26", if you pop up the collar it may be 30", but I doubt it. I'm 5'1" and it runs about mid butt in back. I'm actually really picky about length in jackets and shirts because I am so small, but I was very pleased with this one!

GO for a small! I'm 5'1" 115lbs and ordered the XS, found it was slightly snug, but loved the blazer so much I kept it. Eventually the xs stretched out and now fits comfortably. When I was at the store I saw the same blazer in a different color and in a small only and thought I'd try it on because I was thinking about purchasing another one, although the fit was more comfortable it was visibly noticeable that the jacket was too big i n the armpits. Not saggy armpits but more of like a petite girl trying to wear an average size persons clothing. At 5'1" I'm sure you're familiar with what I'm talking about. So with our sizes being similarly close, I would stick to the small, because I'm sure you'd notice in the medium, what I noticed in the small. Hope I could help!

You should definately get an xs. Im 5'1 and about 20 pounds heavier than you and i got a small, which fits perfectly. If you dont want it to be TOO baggy you should get the smallest size.

I would guess extra small. I always wear smalls though and the small fit me great! It isn't a tight fitting item; it hangs a little loose on me because I have narrow shoulders. I did, however, try on an extra small and the sleeves were tight (and I have very small arms). So if you are worried about it being tight, I would go with a small!

small should fit. I'm 5'4", 112 lbs, 34B, and a small, and it's pretty lose on me.

i am 5'5 120 pounds and i ordered a small. i am returning it for a medium. the length isnt too long, so going a size up wont affect that and the sleeves were about a centimeter too short on me in the small. a medium would have fit perfectly.

since you're taller i would go for the medium. but unless your shoulders are on the smaller side than i would definitely go for the small. try it on in person if at all possible