Manu (aka Sam) is in the background in the red, blue and white shirt, he probably knows more about buttons and cuffs than any man alive, they really are masters of their craft.
... and for the record I absolutely do NOT and will NOT take a commission from any type of establishment. You read correctly. Any special mention of a retail outlet such as Sam's the Tailor is not for my commercial gain and my comments are my own based on shopping in Hong Kong for over 39 years. I recommend them because I have received excellent service, the product I want and a good price, and I believe they rate a special mention - you can make up your mind if you choose to visit them whilst in Hong Kong.