Can someone suggest a swimsuit for me?

I'm not very comfortable with my body or me skin, but i really like swimming and i haven't done for a while so i don't know what i'm looking for. my waist and thighs are kinda big in my opinion, and i have large breasts for a 13-yr-old. I'm a C cup and I'm not thin enough for a bikini. my 3 measurements (BWH in inches) are 40, 32, and 38 and i'm a shrimpy 5 feet tall. in my opinion, i feel too chubby for a swimsuit. i read somewhere that for my body shape i should go with a swimsuit with a sash going around my thinnest part. i'm trying to lose weight by jogging a mile a day, so i don't know where this is going. i don't want to show too much skin either and one-piece suits don't always look good on me.