pleats
褶 centers on fabric folded into pleats, a specific clothing detail.
褶 combines 衤 (clothing) with 習, which likely contributes the sound and may relate to repeated folding or layering, fitting the pleats meaning.
The clothing radical 衤 beside 習 (which suggests repetition or practice) gives the image of fabric repeatedly folded into neat pleats.
For ショウ, imagine a tailor showing off a pleated skirt: show -> ショウ, and the pleats are on display.