Some old clothing swap info for Livs. Note that the doll I used is one of the sleepover dolls, so she has the "pillow throwing" arm and that made clothing a bit more difficult.
Mary Kate and Ashley dolls - Skirts fit but don't close.
Bratz boy- The one shirt I have (short sleeves) fits well aside from it being short and a little baggy in the back.
Blythe- I only have Friendly Freckles. I couldn't get the Blythe shorts closed and the sweatshirt's sleeves caused problems (with with short/no sleeves I imagine it'd be fine, just short. Stockings and boots (didn't try at the same time) fit perfectly. Didn't re-try the other clothes.
Tangkou Doll- I only have Aussie. All clothing (socks, shorts, crop top, and tank top) fit perfectly!
Taeyang- I only have Hash. Shirt fits, a little loose (not baggy, not form fitting). Jacket is baggy. Pants would be perfect if pinned at the top.
Pullip- Varies. The only Pullips I have didn't come with pants and came in elaborate outfits. Ala's leotard thing did not fit, it pulled up most of the way and would work that way. Mir's sleeveless shirt fit, although it was barely able to close it was fine. Mir's jacket thing could be put on and closed, but her arms couldn't move (Nadia's bad arm may have affected that). Mir's boots did not fit, stretchier ones likely would imo. Skirts fit fine, some a little loose and/or long. So I'm guessing sleeveless/short sleeve shirts, stockings, skirts, and jackets would fit. Pants might, but I doubt they'd close. Shorts would likely fit, but again I doubt they'd close. Dresses might work, depending on the fabric.
I also think Liv shoes fit Tangkous, but I've never tried it.