Definition: to purchase; obtain in exchange for payment.
The origin of the sign BUY came from MONEY+GIVE-TO which became assimilated into a non-compound, BUY.
Gloss: me/i bought++ new cloth for dance
English equivalent: I bought a new clothes for the dance.
Notice the plural verb in this ASL sentence. It is referred to more than one cloth, which is "clothes" in English. The signed word cloth is a regular or base word, not plural by itself.