DEAR MISS MANNERS: Can you tell me what "cocktail attire" means? Can you wear a fancy pantsuit? Can a man wear a sport jacket and slacks?
GENTLE READER: Nobody can tell you what "cocktail attire" means. Miss Manners would be surprised if you could even find anybody who had ever attended the sort of event for which this was named.
The two-hour, stand-up drinking party of the past was dressy -- as dressy as one can get without violating the rule against wearing long dresses and dinner jackets, because those are evening clothes and these parties began in the late afternoon. Ladies wore their fanciest short dresses, sometimes with tiny, frivolous hats. Gentlemen wore dark suits and, of course, ties.
But Miss Manners doubts that this is what is meant in any invitations you may receive now. Rather, she supposes that the hosts are pleading for some small effort on the part of their guests.
Whether your specific suggestions qualify, she cannot say; standards vary in different locations and social circles, and you can always ask your hosts. But it is safe to say that your attire should be as far as your closet will take you from the pandemic uniform of sweatpants, elastic waistbands and those raggedy bunny slippers.