What is this close-up picture? (WotsThat: Corduroy wale ridges)

Question

What object is shown in this zoomed-in close-up photo?

SpinelDark · Accepted Answer

Corduroy wale ridges. Corduroy's Hidden Purpose Those distinctive ridges in corduroy aren't just for looks—they actually evolved from a practical problem: the fabric was traditionally used for workwear because the wales act like tiny channels that trap air, making it an unexpectedly warm and insulating material, which is why it became a favorite for everything from railway workers' pants to modern winter fashion.

Answer: Corduroy wale ridges

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