Shadowbringers shifted from giving them completely custom models to repurposing standard gear.
Alphinaud is now using gloves that look to be a scaled-down version of the adult Elezen model, and - while I haven't actually compared them side by side, I'm fairly sure it's changed the size of his hands as a result.
Alisaie is using a standard tunic now (plus the cuffs from her Stormblood coat which are probably part of the hand model). Presumably they just take the adult female version and shrink it down to fit, maybe with some tweaks but not building from scratch.
Still, even if it's technically simple, it may also be a character design thing - keeping them with one or two distinct recognisable outfits.
