Toph goes sleeveless for easier access to her meteorite bracelet, and a slit up one side of the bottom of her long top for movement. She also wears Earthbending armbands and black leggings. She’s still doing Earth Rumble - as well as starting up other things.
Katara’s hair is even longer than before, and she wears layers of flowing robes with wide drooping sleeves and sash clinched high on her waist. She’s started up a school and generally looks very sweet - until she whips out the water from the canisters beneath her long full skirts.
Suki dresses very simply but femininely, a civilian’s form-fitting green robe and plain sash. Though retired, she’s still a Kyoshi - with her fan hidden in her belt, and bandaged forearms and other tiny projectile weapons under her long sleeves. She wears an engagement necklace beneath her collar from Sokka - smaller and styled more Earth Kingdom than Water Tribe-like with coloured beads.