1) Loose trousers 
• (n. pl.) Loose hose or breeches; leather leg quards. The word is used loosely and often in a jocose sense.
Gal`li·gas'kins noun plural [ Prob. corrupted from Italian Grechesco Grecian, a name which seems to have been given in Venice, and to have been afterwards confused with Gascony , as if they came from Gascony.] Loose hose or breeches; leather leg quards. The word is used loosely and often in...
Galligaskins or gallygaskins were loose wide breeches worn by men in the 17th century. Later the term was applied to leather leggings worn in the 19th century.