My personal experience (not the Peninsula branch though): For the 2nd shirt onwards, you can provide your own cloth (i.e. CMT). This price for CMT is HK$ 850 (around US$ 110) per shirt. Also, you can request to get the first shirt, wear and wash it for a few times, then go back to get the 2nd one done (and potentially also request some minor adjustments on the first one), and so on for the 3rd shirt.
Not sure whether other shirt tailors in HK can do the same. I'm just very satisfied with such exceptional flexibility and service. Perfect for newbies like me.
Of course, this works for me because I live in HK.