It is hard to visit the city of Singapore without shopping. The malls by the St Regis and the Marriott are amazing. They have been built both under the city as well as atop of the ground, creating a virtual shopping city. There are several such malls in the Singapore area, but we have enjoyed the ION Plaza (http://www.ionorchard.com/), providing us every store that anyone could possibly want to shop in, all within walking distance of our hotel.
It is about five stories tall (or more). It is hard to say since it is both above and below ground. Michael found an amazing Calvin Klein suit that he bought for special occasions. I love Calvin Klein suits, but the tailoring here is for the Asian body, and for me, the local cuts here don't work.
Crossing the street here (to get to the mall) could cost one a fortune. The designer stores carry heavy pricetags. We window shop a ton, and shop a little.