There's an anime I discovered called Web Ghosts PiPoPa that is a cute little anime but I recently discovered while watching a random episode that there was an AR.
The three main characters have to do an assignment on babies so they go to a baby website Cyberchase style and end up getting regressed back into babies when they step foot in the domain. They are RNed in the middle of the episode with no real process, though the baby transformation does show process, though it is a little bit obscured by a blue flame that envelops them. Clothes don't get oversized or anything but it's still a decent process.
https://9anime.ch/watch/web-ghosts-pipopa.pm44/3y0pmr Happens at 5:05