If you're going from one office building to another, with the occasional cab, it's not too bad. Not that anything is good, but linen will be better than anything else, especially when humidity is taken into account. I've survived a few day trips to the furnace of NY in that rig-- with a linen shirt underneath, of course. Fine cotton would just get soaked. Hitchcock's soft tailoring and more or less unlined body also helped.