Our custom in Tirunelveli side and TVM is also the same. Depending on mama's financial capacity and mutual relationship, the maternal uncle gives the ring (golden) also for the girl.i have not heard of mama seeru, from my palghat heritage.
we call it mama vagai - to buy a pattu sari for the neice for one of the wedding occassion, i think oonjal. in my neice's'cases, both bought the saris, and i paid them cash equivalent...