Never tried on a real pair of Aligns, although I have other lulu stuff so take this with a grain of salt! I ordered a size small and they came marked a 6. I'm normally a 4 so they are too big for me. The fabric on these are pretty nice, better than your basic forever 21 workout leggings, but they definitely aren't the nulu fabric that everyone raves about. Comes branded and the logo on the back is reflective like the auth. Pretty comfy, stitching is good, and they're squat proof, just wish it was my size.