I tried to design my avatar as it wouldn't load (again)
And it wouldn't let me equip any cosmetics, it only said "unable to equip" or something like that.
And after a while, this torso, arm, and leg piece appeared, as my head was the only piece that wasn't invisible, I couldn't change the hair style, skin colour, eye colour, or eye shape either.
Hope this helps, have a nice day!