2000's
Though it's probably more like, 2000-2005. I kind of kept to early-mid 2000's rather than anything from the latter part of the decade. Possibly because I graduated high school in 2010 and I really didn't want to analyze my high school fashion...
Anyway! I actually used one of my 2000's Sims from my old Decades Challenge to model this :) Miss Lilac Beckham, who ended up being one of my favorite characters of all time to play and write.
https://64.media.tumblr.com/ef77e1fcb3b337f23a7b9562973a2fff/53fdb19ef7af6acd-1f/s1280x1920/0217bfa960f656e9e5e8a8101c2e943a555fe944.png
https://64.media.tumblr.com/c87a5a9ef7e938bda73f1a207c8a0182/53fdb19ef7af6acd-e9/s1280x1920/7e9e8b0920267b70860b7ed6e6440ceec3acbc4c.png
This actually concludes the T/YA/A feminine decades outfits! I'm going to work on children's next, though it'll likely take me some time and we may see a lot of repeated outfit styles and skipped categories. At least for the early decades, there's not a lot of options for historical children's clothes.
As always, I'd love to see anyone else's ideas for CC-free decades looks :)