There is a double layer inside at bottom of panties (gusset). What
Why there's an 'odd pocket' in the crotch of your knickers
Panty Gusset 101: Why Do Women's Underwear Have a Pocket?
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The Little Pocket in Women's Underwear Has a Purpose » TwistedSifter
Underwear Gusset
What's the Pocket in Women's Underwear For?
What is the pocket in women's underwear for? – ThirdLove
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What's the Pocket in Women's Underwear For?