YARRCOShapewear Bodysuit for Women Tummy Control Open Bust Shaping Bodysuits Seamless Full Body Shaper

Not sure what size to go for I'm a 12 in bottoms and a 14 in tops, should I go for the 12 as it's my bust that needs size 14 bra size 32-34 F

Do you get a panty line under close fitting clothes?