Yes. In the necklace sense, airbender monks and nuns have been shown to have prayer beads. Also, upon entering the Fire Nation, Katara purchased a necklace from the Fire Nation Bazaar. The presence of a selection shows that neckwear is quite frequent in that particular division. No Earth Kingdom citizen has been seen wearing any form of neckwear, apart from Earth King Kuei whose attire consists of a green bead necklace.