icyzoneWorkout Tank Tops for Women - Racerback Running Yoga Top, Gym Sport Shirts 2-Pack

I'm a 34C bra (normally size 10) & it says I need a medium - is that correct as a lot of people saying sizes are on the large size ?

I'm a size 12-14 what size you advise. Are these long I'm too old to have my bum on show I'm 5ft 2 thanks