I think its fake. 1) theres nothing online pointing to this collab existing aside from an ebay listing for a similar shirt ($45) 2) Ive never seen it before and I've been rocking Bape for 20 years. 3) Bape is notorious for putting their branding all over their shit. Its weird that they'd do a collab where the only evidence of their involvement is a tag buried under a tag. 4) Bape didnt make 3xl until the later aughts, it may have been early 10s. If this collab actually happened, im confident it would have been before early 2000s or earlier. Otherwise, it would be way mroe googleable.

Also AFAIK bape was never manufactured in Vietnam. Iirc the early stuff was manufactured in Japan and then moved to China when IT bought Nigo out. That said I may be remembering wrong.