It's possibly a 1 color print using halftones or it could be done with multiple screens to achieve higher detail and more tonal range. I haven't seen this shirt in person and it's hard to tell from that pic.
If you want to do something like that and you're fairly new to screen printing, i'd look at doing a 1 color halftone print.
you would need to be able to print a large positive. Then in regards to your ink, you could either add a soft hand extender to lighten your plastisol, or use water based ink. I think the biggest problem would be getting a positive made in that size. I have been able to make some large positives by printing two large (13x22) positives. The only problem was with the halftones when attempting to line up the positives. When burning them, they tend to have a line down the middle due to either washing out or screwing up the halftones. Aloha
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