Hi Tatty,
If you're thinking of looking for them in Sg, there are a few locations.. But nottoo sure of how much they are charging their kebayas..
you can try the shops above New Market Road Food centre. I nv took down the unit no though..
I happen to come across 2 shops that tailor kebayas. They I tink they do have off the rack ones too.. But I must say that their varieties of kesosongs are very limited. Max i tink is only abt 5 designs.
I did enter one shop with 2 ladies. One was at the sewing machine and the other was attending to a customer. I personally feel that she's rather stuck up and not friendly. She doesn't smile and No way to try bargaining with her. She will just tell you their prices are fixed. She's selling her kerosang at $25 nett.
There's another one with an uncle attending the shop. He's quite friendly.. I find his customer service is so much better.. I was able to negotiate in getting the kerosang from him from $28 to $20. So I just bought from him though I still feel its expensive.
If you wana get more varieties of kerosang, you can try joo chiat complex. There are a couple of shops tailoring and selling off the rack kebayas too..