I am 5'10" and 135 pounds so it is not easy to find pants long enough that are not huge in the waist.I bought size 8T at first since this was the size that fit in the dark rinse blue jeans. However they were too big so I had to get 6T. These fit me great. In general, the sizing for pants is not consistent between different styles. Sometimes I need 8T, sometimes 6T.