Your best bet is to have someone who knows what they are doing measure you. Then try your luck with some of the online vendors, do a quick search here on custom shirts and you should get plenty of recommendations.

I had a half dozen shirts made in Hong Kong, I was measured by a tailor. Overall I like the fit and fabric. I was able to see and touch the fabric before ordering though.

I just picked up another half dozen Hart Schaffner Marx shirts from the same tailor at close to cost, and I have to say I like those better. I was surprised they actually fit me, not quite as well as the custom shirts, but pretty close.

Good luck!

Jack

 

I believe mytailor.com has the option of either measuring the shirts you have now or send them in to be copied. The shirts are sewn in HK I think.

I recently ordered a cheap one with them to scope out the quality, fit and what not. The review here seems to be fairly good.

 

I've used mytailor.com and found the results to be excellent. Measure twice and order one as a 'tester' first. I did that, got a shirt that fit almost perfectly and have since ordered again with slight modifications. For the price they beat most ready-to-wear hands down - expecially if you're particular or hard to fit. Service has been excellent too in my dealings with them.

I've tried both their 2-ply superfine and Executive collection fabrics, someone else suggested stepping up to the Mason line.

 

I think you'll get the best results by mixing and matching. Use your actual measurements for things that are easy to measure (chest/hips/waist) and the measurements of a shirt that fits you well (shoulders, wrist, etc.).

Of course you have to make sure that whoever you communicate this to understands what you're trying to tell them!