Women's Active Core Zip Through Long Sleeve

So I read through all the reviews and was not sure what size of this jacket I need to get so I'm gonna tell you what's up. I am 5'4" 114 lbs 34c ir 32dd. I read different reviews on the sizes so I wasn't sure what size I should get. So based on the reviews I ordered a large even though I am typically a small to an extra small. So I receive the large and if it's OK but I am going to buy a medium so it will be snug but not too tight. The pants that go with it you have to get an extra extra small sadly they have sold out and on COTTON ON BODY'S website they do not sell an extra extra extra small so I'm going to go ahead and keep the extra small since baggy is cold these days but in the jacket I'm going to order a medium that way it will be snug but not tight I hope this helps