Kelleytoons (7/7/2018)

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If you could settle for a v-neck I did find one at Daz that would work.

It's very odd that it's so hard to find any pocketed t-shirts (perhaps that has gone *way* out of style).  If you were artistic enough you could do this yourself with maps (I'd give it a shot but I'm so far from artistic it isn't even funny).

gcshep (7/7/2018)

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you might find something here 
https://www.wilmapsdigitalcreations.co.uk/introduction.php
Best Regards
George.

Kelleytoons (7/7/2018)

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I did this in about five minutes (from the Daz shirt):

Delerna (7/7/2018)

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And some more options.
Load a Plain Base tShirt that comes will CC. Send the Diffuse map to a 2D tool. I used Kritta here. And Draw a pocket shape on a new layer.
Save it and it updates CC, move scale and adjust its colors until happy. Just need to change something and save it to update CC so you can see how it looks.
These 2 took me about 5 minutes (they are pretty simple)


and of course if you want something easy but looks good you can go to google do a tShirt pocket search and copy one you like.
Past it into a layer in the 2D editor. Use rubber tool to remove everything not needed. Scale and move it and save so it updates CC for checking.
This one took me 2 minutes



UPDATE
Of course cant sell that one gotten from google but fine for personal use.
You can use them as a guide for drawing your own though

Rampa (7/7/2018)

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You could use one of the decal pockets on the plain t-shirt.