Believe me I totally get it. I've seen some cliche "ugly american" dressing in LHR, HKG, and... uh... Manhattan.
I just hope not to pass out from wearing jeans in 93F temperature. I barely survived a Christmas in BKK. Hot and humid are not my friends.
The 10-day forecast for Dubai has the highs in the mid-80s and lows around 70. That's not too bad with a light-weight shirt and pants.