I've just remembered a word that makes me truly cringe as used by Americans, "panties" thank God we don't say that here! it just ridiculously coy. Knickers or pants please, although I realise the latter word is used to describe trousers for men in America.
Not too Wide leg linen blend trousers



ALL the area should only have been called their "bottom" in her mind! Aww, Happy Days! 

