If you want a cozy and chill dress up game on the Switch, then Fashion Dreamer is by far the best option. The game gives you a lot of ways to express your creativity through fashion and I think it's a lot of fun. It's not perfect but I feel the need to give it 5 stars to counter all the negative reviews it's been getting here, because the game really doesn't deserve it.
It's a very unique game since you can design clothing, make your own brand, design a showroom to showcase your brand items, create outfits for real people online, increase your followers and unlock various collectables/cosmetics. The gameplay loop is addicting for me and I think I'll be playing it for a long time.
The game is getting free updates too starting in December, which is amazing. Just don't expect the game to have a story or anything deeper than dressing up and designing and you'll have a blast with it!