It appears Sephiroth got "Nomura'd" lol, which is a phrase token to Tetsuya Nomura, the character designer for Final Fantasy, who has a tendency to give characters cool and unique looks and accessories for just style points, with no actual function/relevance. He claimed in an interview years back that he had no theory behind AC Cloud's redesign other than "it just looked cool" and this sort of became a meme lol. Sephiroth's belt was added in FF7R simply for style points (and possibly a place to holster his Masamune) and otherwise, aside from the belt, he appears to share the same outfit as in AC.
A long shot, but I'd love to see the Kingdom Hearts remakes of Sephiroth & Cloud. Even more, I'd LOVE to see Sora!!!! I know it's so unlikely but they are
Gametoys, however... But for now, it seems they are very focused on their Final Fantasy line, and good for them, their success shows
Also, in relevance to your topic, both Giantoy and OneSixthKit are the best. Top tier websites! I've spent over 1k on Giantoy and I'm new to OSK but Kit is very friendly, active on the forums here and offers great prices and a great service!