What is the difference between "knickers" and "panties"? I've read the difference is that "knickers" used in the UK and "panties" is used in US. Is this the only difference?
That's what I've always assumed. Wikipedia seems to agree:
In British English, and in places such as the UK, Ireland, South Africa, India, and occasionally in other Commonwealth nations such as Australia and New Zealand, panties are often referred to as knickers. The term knickers is not generally used in the US and Canada, where the term "panties" is usually favored. In the UK, pants is also used, but can mean men's or women's underwear. This should not be confused with the North American usage of pants which are called trousers in the UK.
Also knickers , in the US at least, is short for knickerbockers.
In the U.S. "knickers" refers to "knickerbockers," or "shorts" for MEN that are OUTERWEAR.
"Panties" refers to "underwear," and specifically to WOMEN's underwear.