Just throwing this out there, but the way it's tailored to him makes me think custom
Found this one at Target for $19.99. Brand is C9. Not exact but similar. Price was right.
http://bestii.com/~wamser/AvengersTandArc.jpg
Wearing the arc I made on my 3D printer underneath.
I ordered this one in a medium. I'll let you know how it turns out
Mens Thermal Compression Fit Base Layer Winter Under Wear Long Sleeve Shirts | eBay
Paul
I have that one as well. It is closer than the C9 although a bit thicker/warmer. The arc also doesn't shine as brightly through it due to the thickness. Other than that it looks great.
Ed
Could We not remove the fleece from the inside just where the arc is? I'm sure that's possible
Paul