This is a white inner layer with lace around the neckline. I think it would be cute worn under a knit sweater or sweatshirt. It can also be used in formal settings. Although it has three-quarter sleeves, those with shorter heights might find that their wrists are slightly visible. It can be worn without ironing. The size isn't listed, so I've put it as M, but I think it's free size. Please feel free to ask if you have any questions.