This is a long-sleeved cut-and-sew top from the British luxury brand, Joules. The fabric is thicker than a t-shirt. The material is 100% cotton, and the inside is slightly brushed. The size is 8 years old, 128 cm. I've worn it about twice for going out, but there is some fading typical of navy blue. I don't think it's particularly noticeable, but please refrain from purchasing if you are concerned. It appears whiter in the photos than it actually is. #RalphLauren #PetitBateau #Mikihouse #Familiar