I am 5'1'' and most normal size retailer tops are too big on the armpits and neckline for me.
i don't usually go for peplum, but i was drawn to this top bc it was very soft. when i tried it on, everything fit just perfect and length was also right for me. i like slight stretch of this fabric which hugs body nicely. i would say you should get a size that fits nicely on chest area.