Completely agree. For the DS, there's actually quite a few fashion games. Style Savvy has the first game on DS. I've been looking for similar too actually. There's a fan-made translation in progress at the moment for FabStyle which is a fashion game mixed with a dating sim. There's Shining Nikki which is a 3D dress up game for mobile (it's pay to win though).
For other DS games with fashion: 1. Imagine: Makeup Artist 2. Princess Debut is a rhythm game where you pick a partner and date princes. But it does have costumes for the main character.
I'm not sure what else I can recommend. There's Touch, a game where you control a dancer and dress them up. But the company that runs it has a bad habit of shutting down their games. Lost my old VIP account that way and they stole assets from Shining Nikki.
Dream Girlfriend is a social (and gacha) game run by Ambition (though they do have a habit of also shutting down their games. They abandoned Dream Boyfriend, for example and completely shut down Fairy Doll).
Time Princess plays like Shining Nikki and there's a way to speak to people on it.
I would've recommended STYLIT, but that one got shut down. :(
If I can think of anything else that's similar to what you're looking for, I'll let you know. Do you have a Nintendo Switch?