I need your help, Travel Fashion Options

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So, in the Spring May 13-21 I'll be taking a trip overseas to Tokyo. Now, the fun part is finding clothes that I can wear there, that I don't necessarily have to go shopping and drop 5K on.. So, what I'm looking for is 4 days for casual sight-seeing clothes (Tokyo weather in May [maximum 73°F]/[minimum 57°F]) I'll be spending a lot of time outside, so light clothing that will keep me comfortable is necessary. I'll need one formal suit for the hotel dinner, cause it's formal-wear only. I don't remember my exact sizes. I can get those taken within the next week and update this thread. For casual clothes I wear a 32 waist, 32 inseam. T-shirts are medium. Button down shirts from Macy's I think I was a 16 1/2 - 17. I'm 5'-11". The type of clothes that I do like aren't very colorful, typically stick to a low color palette of blacks, whites, and blues. Feel free to throw anything in the mix, if you feel that I may like it. Weblinks work wonders as it allows me to know the exact thing I'm looking at, and maybe buy it somewhere local, cheaper.

budget: $2,000