Panties are a kind of underwear. Women's panties are also called "knickers". Other names are underpants ('undies'), briefs and smalls.
Knickers in British English only refers to female panties; in American usage the term is also used for a type of male trousers more properly called "breeches".
Bloomers are panties which are more voluminous (~bigger).
- See also bikini panties