There are many ways to sew a knit binding as a neckline or
armhole finish.
Version 1 is a short - sleeved peplum blouse, version 2 has 3 / 4 - length sleeves with a cuff and menswear - style placket, and version 3 is sleeveless, with
armholes finished with bias tape inside.
Not exact matches
(* note: I made my example romper without trimming down the sides but will show you a way to decrease the
armholes once the romper is
finished).
Bias tape
finishes the modest scoop neckline as well as the
armholes.