I think his Gen 6 outfit was even closer.The closest outfit to date that Ash has worn that, aside from the cap colour and inverted shirt, is pretty much directly copied and pasted from the male protagonist of SM - in contrast to other outfits he's worn.
Eh, between the lack of the matching hat (and the sunnies to go with it), the short sleeve in spite of it being very close otherwise, as well as the choice of shoes not being boots among other things, I believe that not to be the case. I think the SM outfit is far closer in that regard - the only differences in that outfit are the colours, otherwise it's a perfect carbon copy. Even the bag matches!I think his Gen 6 outfit was even closer.
Laziness.Dhelmise.