Charcoal vs Navy Suit for Asian

I am a young Asian gentleman still at university. I am around 171cm tall (5 feet 7 inches)

My first two suits were both black, although I can’t really tell if the other is black. However neither of them fit me very well. I have wide shoulders, thick back, slim waist, but super flat chest. As a result, it’s really hard to find anything that fits me off the rack.

I’m thinking of getting a tailor-made suit. There are two questions:

1. Charcoal Grey or Navy Blue? I want to get a Navy Blazer so maybe I should go for Charcoal?
2. Where should I get it made? I’m from Melbourne, Australia but will also be travelling around US at the end of the year. May also visit Hong Kong in the middle of next year. Which of these places would be best to get a suit? Or should I look online?

Also the suit is for future interviews and networking opportunities. Main purpose is to help me with internships and job opportunities.