1 months too short a lead time. Sure you can get a tailor to do it but it might be more costly (expedited service charge).

Assuming you are using the tailor's cloth (not your own) be prepared to dish out 2.5k and above (completion time - 3 months)

Easier to just buy off the rack and get it altered. Faster and might be cheaper too.
Dont' think Ah Loke can work so fast. He did mine in 2 months (consider damn cepat edi).

i've heard of this tailor.. care to share his contact details perhaps? thanks a bunch