Does Curt's shirt have a tag in front?

In a few scenes, especially when Curt finally gets to talk to the blonde on the phone, you can see a rectangle of stitching at the front of his T-shirt collar. Was he wearing it backwards every time? Or maybe wardrobe sewed name tags in (but that location would be super annoying)? Or what?

Next time I watch the whole movie I'll keep an eye out for the same thing on everybody else's white T-shirt to see if it really was an actual thing for some brands or maybe a wardrobe thing.