These pants run quite small for Caslon. I often have to size down to an XS for this brand, but here the S was skin tight. Part of the reason is that these pants are fully lined: great to avoid the white being see-through, but the lining is about one size smaller than the outer layer. It also bunched oddly just below the waist-band giving a weird diaper look that was very unflattering. It may have looked better in a M but I didn't love how heavy they felt anyway.