These pants are a stretchy material but do run a bit small.  Model pictured is wearing a size 5, and we recommend sizing up one size. 

1 ~ 0

3 ~ 2

5 ~ 4

7 ~ 6

9 ~ 8

11 ~ 10

13 ~ 12

15 ~ 14

1X ~ 16

2X ~ 18

3X ~ 20