Second model is 5'8" in height, a size 3/25 in jeans wearing a size small and could have sized up to a size medium.
These jeans run small. Below is what size to order according to your jeans size. If in-between sizes, we recommend sizing up.
Small: 0/23, 1/24
Medium: 3/25, 5/26
Large: 7/27, 9/28