Even though I live in Florida, it has been difficult for me to find an ultra light suit or sport jacket which is truly comfortable in hot climents. I read several TripAdvisor blogs about bespoke, or custom taiored clothing, and decided that I would extend my stay in Dubai long enough to have bespoke shirts and at least one suit made.
Following advice from others, I contacted Mr. Rajesh Lalwani at Santoba Tailors and asked if it would be possible to have a very light weight suit made in the 5 days I planned to be in Dubai. He and his staff were very obliging and provided me with a rather enjoyable shopping experience. Having a talored suit made is actually less of a hair ball than trying to find clothing off the rack which fits.
My advice to travelers who like to pack light is to try the bespoke experience while in Dubai and have an expert talor like Rajesh help make the right decisions.