I was very hesitant to purchase the romper for myself being almost 5'8". Mainly I was scared if I sized up it would be too big in the chest as I am NOT busty.
My normal go-to-size is medium, but I got size large for extra length. It hits just at the ankle, but for me doesn't look or feel too short.
My biggest concern was the chest being either too baggy or sleeves falling off the shoulder with wearing no bra. NO ISSUES AT ALL! I love it!! I wear it all the time, its super flattering and really lengthens the look of your legs.
165lbs, 5'8". Chest 34", waist 30", hips 42".