when men wear dress shoes, pants, belt, shirt and tie, what is the equivalent on a lady?

i could see a conservative business suit in the category, but what else?

does age make a difference? the age group is 17-26ish. maybe more like 18-23 years old.

occasion? i am supposed to speak(with powerpoint) to a group(maybe 30 or so)

ps it is not a real presentation, but a class assignment.

the male prof says, men wear this, tie, etc, and then doesnt say anything about women, because since hes a man he says he doesnt know. fair enough, but i dont want to be underdressed since its for a grade.

i was thinking dress shoes, suit pants and a button up. all non crazy colors and styles. appropriate enough or not enough?

also if anyone could recommend a book about ladies formal/business attire that i could get at barnes and nobles. com or something, thatd be great too

I live in the northeastern U.S. and have my first job that requires business attire (I just finished college). Usually I’ll be wearing a shirt and tie, but also a suit occasionally. What kind of coat is appropriate? The same kind of normal winter coat that’s worn with casual attire? Or something more dressy?

Thanks!

I am not so good with fashion, the suit is a dark blue with pin-stripe, is this too “business professional” or is it suitable for a wedding. Also, if so, what would be a nice color shirt and tie to wear with it.

The pinstripe is very small, it is not too flashy or anything like that. Just not sure if it would be a good color.

My wife works in a law office and always wears professional attire. Quite often she will wear a shirt and tie with a business suit. She wears the tie as a man would, the shirt buttoned to the top and the tie tied tight. Is this ok or is she committing a crime against fashion?