I usually purchase size "S" for non-stretchy tops. For reference, I'm 5'8 (hence long arms and long torso) and very small boobs (32A/B). However, since the top bit and sleeves (which give jumper vibes) have no stretch, I went with size "S. " This was the right decision BECAUSE IF YOU SIZE DOWN, YOU RISK MAD BOOB SPILLAGE CAUSE THE TOP PART IS SUPER-CROPPED! If I raise move my arms or move my body around doing whatever, you'll see some underboob action, but tastefully, not too much. Yet I have the smallest perkiest boobs! So I'd advise you to stick to your true size FOR NON-STRETCHY tops. The mesh bit is PERFECT for my long torso! So this is definitely tall-girl friendly. I paired this with wide-leg black denim cargo pants also from FN and some kitten-heel sandals, and everyone said it's their fave casual (but dressed up) fit in my closet! That all-black look is FIRE!!!