That's just vague enough of a description to be probably-doable, and Taako nods along like a good competent shoemaking elf. It's not like he's gonna charge if it's a disaster, he's not a complete scam artist, here. Not in like, this situation anyway. But that probably won't even be an issue so it's fine.

Oh, what, is this dude about to be elitist about where Taako sources his materials? Is he gonna have to explain that leather shoes aren't vegan? He's not really giving Taako enough to go on, here, and that doesn't inspire trust. "That's one hundo percent genuine tigershark, my dude. So uhhhh, to answer your question, the ocean?" He plays it just dumb enough to get plausible deniability re: sarcasm. "Not a lot of other sources of leather on this island so far. Hope these things aren't endangered." If they weren't before, they're probably gonna be soon.