"lucky" underwear for special dates
Colloquial term for underwear (especially panties) worn when hoping for romantic success, such as on a date. Often implies a playful or superstitious mindset. Compare with 勝負下着, which is a broader term for special-occasion lingerie.
See also: 勝負下着
I have a date today, so I wore my lucky panties.
I went to the lingerie section to buy some lucky panties.