If you are looking for bigger size bra, u all can try to get them in Kuala Lumpur. The bra size over there are larger, i've even seen an E cup, in addition, the designs are beautiful. Thus, it's really worth going to KL.
KL offers brands such as Debenhams, Marks and Sepncer, Triumph and Wacoal.
Moreover, if u go during December, lots of shopping centers are having sales, you can get beautiful bras at a cheap price.
So be sure to visit KL if you have the chance.