Whenever I come to Vegas, I usually make it a point to just do most of my shopping here. It's a good way to kill a couple of hours.
They have the usual brands, including my faves Gap, Banana Republic and J.Crew. They also have a couple of Starbucks stalls and a food court.
The place is huge though...pick up a map at guest services and plot your course carefully....or just pull up the map on your cell phone like I do.
I typically end up buying way more than I anticipated and Priority Mailing it all home - which sometimes is cheaper than checking a bag.