Each item has been worn about 5 times. The left one doesn't seem see-through unless you hold it up to the light, but the right one is black and it's hard to tell, but it's a little sheer. How about it for spring and summer? Simple black long-sleeved shirt with a dot pattern, XL size. - Brand: UNIQLO - Size: XL - Design: Dot pattern - Color: Black - Design: Dot pattern Thank you for looking.