What should I wear under a dress?

The answer

Wear what suits the neckline, back and fabric of that particular dress, and bring those undergarments to every shopping trip and fitting so you can judge the true look. Strapless, backless and sheer styles may need specific support or a slip, and a lining can help with coverage. Ask the stylist about options for tricky designs, since a well-chosen layer can make the dress hang better.