What is a lounge suit for women?

Answer 1

A lounge suit is another name for business suit and usually indicates a semi-formal function. A darker suit with a white shirt and tie are appropriate.

On some occasions, if the function is an informal outdoor afternoon affair, then the lounge suit can be more casual, lighter colored, and worn without a tie. But, when in doubt, always dress more formally.

For women, a lounge suit normally indicates a shorter length dress or outfit as opposed to a formal floor length gown.

Answer 2

It could be something like a pair of silk or satin lounging pajamas that you can find pretty much in any department store.