Macy's is a huge store and can be quite hard to find your way around. Keep looking at the floor charts to keep your bearings.
There are around 2 floors of men's clothing and I managed to find some good stuff there. DKNY, Levi's, American Rag to name a few. If you're out there for some clothes shopping then you have to visit Macy's at least once and see if you can find any bargains. You quite often find items at 10%-50% off!
If you're on holiday there then make sure you go to the visitor center which is on floor 1 1/2 and get an 10% off card for all out of state visitors. You may have to take your driving license or passport to prove you're a visitor to Las Vegas.
This gives you 10% off most items although there are some exceptions which it states on the card.