panties meant to be seen; show panties
Colloquial term for underwear designed to be visible, often with decorative lace or patterns, so that it is not embarrassing if it shows. Common in fashion contexts.
Lately, show panties have become part of fashion.
彼女はスカートから見せパンをちらりとのぞかせていた。
She let her show panties peek out from under her skirt.