Now this is a pair of leggings I don't mind paying full price for ($39.50)! Ladies, these are a must! Will keep you warm outside in the winter, but you can also wear them inside without sweating to death. They aren't bulky and look like regular 'going out' leggings on the outside with an ever so thin layer of soft fleece on the inside. I bought one pair and didn't take them off for 2 days...ya, kinda gross - but good right? I knew I needed another pair immediately (or 2). They wash well and can go in the dryer too (click above or photo for link).
Tip: these do not stretch quite as much as regular leggings in the legs so they may feel like they are too small at first, but they will stretch out 'a little' once you wear them a couple hours. The sizing will depend on your body type. I am pear shaped with athletic legs, so I went up a size for my hips and thighs and they fit me well and are comfy (although a tad big in waist but they still stay up). Overall these run pretty TTS, especially in length. So I'd go with your regular size.