I visited Koh Samui for Christmas and we ordered 4 x suits and each one of them looks great. We left it until the last minute so didn't give them much time at all, however, they managed to pull out all the stops to complete them on time. This included a fitting at our villa.
Santosh is very knowledgable regarding the material and the price was good too.
We used the Armani International shop based in the Centara resort, Chaweng. Highly recommend the wool/silk mix fabric.
Wish I had ordered more suits while I was there so I have ordered on more to be sent to me in the UK!