Go-to-hell pants are a type of slacks that have garish colors or patterns.
[1] They are worn as casual dress, but typically the only outlandish piece in an outfit.
[1] Patterns or embroidered figures are common as well, as long as they are not too transgressive.
[1] The term dates to the 1910s and refers to fashion disregarding norms of good taste.
[2] The pants became very popular among east-coast elites in the 1950s.