Chanel RTW Sizing

Hello lovely ladies! I am purchasing this sweatshirt - I am usually a US size 4 or 2 in regular brands. Anyone have it and can let me know how it is fitting? i am a 34C - I don't want it tight, but certainly don't want a huge sweatshirt as I plan to wear it tucked into jeans, leather skirts, shorts on a cooler summer day, etc. Any input would be much appreciated - on this particular sweatshirt, or any Chanel sweatshirt. Thank you!
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I want to buy used chanel tweed jacket. I'm not sure I'm size 36 or 38. My shoulder measures around 15 inches, bust 34 inches and waist 31 inches. I'm 5'1 and approximately 120lbs. I normally wear petite 6 in jcrew blazers.