Turn your shirt textures into iconic… art. Or something. Supposedly there may-or-may-not be a way to make icons via the Skin Acceptor Wizard thing, but nobody knows how to get icons out of that if so. 
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The first is a semi-transparent overlay for your shirt texture if you so choose to use it.
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The second is an opaque underlay you can choose to use. By deleting the black and white space from your actual texture, you can see what pixels are important.
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The third is the template for your HQ shirt icon.
Few examples of it:
The Grassland Military Top, an item from the curated Greece map (of which none of its curated content is in the Icon folder yet!
The Orange Scorpion 7 Explorer, an item from the Freddy’s Explorer Clothing mod! The mod is broken though because Freddy is working on a huge project at the moment, but you can pretend! 
http://steamcommunity.com/sharedfiles/filedetails/?id=1181032631
The Construction Jacket, by me! It spawns on maps using official spawn tables, so you should totally check it out. 
I had technically already made this icon before the templates, but I apparently saved over my full-size version, so I had to remake this post. 
http://steamcommunity.com/sharedfiles/filedetails/?id=1251329209
