My measurements are 31-25-34 I am 5'2 and 114.5 lbs

Small or XS. Gosh I wish my waist was 25 in.

probably XS to S from what I referenced to: SIZE BUST WAIST HIPS XS 30-32 23-25 32-34 S 32-34 25-27 34-36 M 34-36 27-29 36-38