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

[sw33t_rouge]

I like uniqolo for casual style
plain simple all you need is some accecories hats belts..etc
the whole straw hat thing is big at japan right now
and ankle high pants..in tw we call it AB pants not sure what they call it in the states.