They fit very well on my thin, athletic child. My son has a 24 inch waist and long skinny legs so I've been tossing between 12slim and 12reg. When I found out they have an adjustable waist I went for a size 12 in case it eventually started to fill up. The new ones were a bit loose but after washing they fit perfectly! He really likes the materials and says they are soft and stretchy and hold their shape well without being stiff.
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