I've done a tailored suit at Kinslager (Desa Parkcity).
I am very happy with the final result. Measuring went ok. I just wanted to come back for at least 1 extra fitting session; and they didn't find this neccesary. I insist on a 2nd fitting. When you go to a tailor in KL it is quite important that you can give them the needed input yourself. I wanted a modern suit (not Italian or any other style per se); in my opinion it was just a regular suit. This meant I have to give much information; about the style (buttons, inner fabric, natural shoulders, armholes, open front cut, clean back, lapels, pockets etc...a lot to keep in mind as some tailors will mainly do their own style/thing).
I had suits made in the Netherlands; and if find it weird that the quality fabrics are cheaper over there then here in KL. The s100, s120 and even higher are cheaper in NL?
Tailors I considered too: Bespoked 1U and Ah Loke Tailor...
Bring your own fabrics
Don't accept flaws, do accept minor flaws (which prove the suit is tailored)
Bring your own inner fabric
Bring your own ultimate buttons