Things That Y Fronts, the Wonder Garment, Can Be Used For.

[slowmotion]

They are excellent for temporarily plugging holes in GRP boat hulls. Their shark-repellent properties are an added bonus.

 

[FrankCrank]

Over this way, it's pretty hot for most of the year, so a spare pair could be handy for mopping the sweat from your brow.
Not sure if this would be accepted in polite company.