Thanks everyone for your useful inputs. I will research more about your suggested shirtmakers.
Culverwood: I know about Marks and Spencer, but they don't ship to Hong Kong. I read that in their website.
By the way, I'm not from Hong Kong. I just want to have the shirts delivered there because Hong Kong is quite lenient with custom duties. I'll have the shirts delivered to my friend there, who will then ship the items to me here in the Philippines.