I love these shirts, I have 4 of them now. I had bought 2 a few years ago and love them to travel, they are perfect for layering under dresses and blazers, or as a protective layer under wool sweaters, and work well as pajamas too. I think they run true to size as a 'fitted' turtleneck. I have them in both medium and large, the large tends to stretch out over the day and becomes a little baggy, the medium is more consistently fitted so is better for wearing under low cut dresses. They are a little see through, but if you wear a black bra it is fine and can be a little sexy if you want to wear it that way. The 2 I got a few years ago seem to be better quality than the ones I ordered here, the wrist seam opened on the medium one after 1 wash, and I wash them in delicate bags. But whatever I guess, I they are so soft and comfortable and very flattering. I also did not find the neck to be too tight on any of them as other reviews have suggested, but I wear a lot of turtlenecks so many I don't notice.The material is a bit thin so I will have layer with another top or jacket alwaysMaterial is light weight and super comfortable. If you are looking for a turtleneck for layering I highly recommend. It can also be a stand alone for just a breezy day. Clings in all the right places.Pros: Soft, the sleeve are longer than your average long sleeve, not super see-through, turtle neck part is nicely sized.Con: Too short. Ended up returning because it was too short for my liking. Not exactly crop top, but not regular shirt length.American apparel seems to get smaller and smaller through the years in their sizing. Ordered an XL and the top fit like a medium. And before anyone thinks that I've gained weight through the years or age, on the contrary; I'm in the best shape I've been even when I used to shop with them over 10 years agoMaterial is very thin. Could be a pro or con for you.I love this shirt! It does like a glove!! I love how the material is so soft and stretchy. Totally would recommend!!The neck rolls down, the material is see-through. I thought this was a premium brand. I have gotten better turtlenecks at Target for half the price.Fits really nicely ?