Mustaffa level 2 souvenir section I think may still carry it. Otherwise goto Chinatown along temple street area
Hm...maybe should pay Mustaffa a visit to check the quality.
There souvenir shop @ Crown Plaza Changi Airport do have the replicas.
I found this on the Net. A full set for US$59.
http://sarong-kebaya.com/product-category/best-seller/