Anywhere along Michigan Avenue - Sears, Bloomingdales, etc.
Avoid 'Victoria's Secret' - highly over-rated. When shopping for something for Mrs Shillard, I found Nordstrom to offer the best selection - and the most helpful staff. The attractive young female salesdroid recommended a new range of hipster 'thongs' because:
"They're really cute, and really comfortable - see?"
And she pulled her dacks down and showed me.
Sold.