Lululemon Align Pant
Lululemon Align pants > every other pair of pants. The most comfortable, flattering workout pants I've ever worn (and I've tried basically all of them). They are lightweight and thin, and somehow smooth things out on your bod, which is a contradictory miracle. I winced when I bought three pairs at once because of the price tag, but since I stopped wearing everything else once I had these, that makes the per-wear cost by now approx $.01.
There was a period of time recently where I decided that I didn't need Lululemon in my life - and wow, was I wrong. These Align pants are my favorite piece - the waistband covers any issues, the material is thick enough to hide lumps but stretchy and soft enough to make you WANT to put these on, and you can machine wash them. Amazing.