Most of us have one. The 'go to' dress. The dress that makes you feel beautiful. The dress you can glam up or down.
Mine is a simple stretchy Prada shift dress I found in TK Maxx! It was one of those 'I can't believe the label . . .oh God . . and it's my size . . . oh DEAR GOD . . .and it's AFFORDABLE' moments. It was £100. Fitted like a glove. I stood in the changing room whimpering at how well it looked. In the actual Prada shop, a very similar dress was £950.
Anyway, it's a dark burgandy, thick stretchy fabric, just touches the knees. A perfect shift. I've worn it to parties, dinners, and work meetings. It makes me walk taller and feel expensive. Anything I wear with it, looks automatically classier. As long as I don't put on a lot of weight I will have it forever and my daughter can have it when I'm an old lady (and not a minute before, are you listening DD?) 
What about your favorites?