I have that or one just like it, and I've found that with a singlet tee under the jacket I'm pretty comfortable. (My wife insists it's called a 'singlet' - she was aggravated when I asked her why she bought me a pack of 'wife beaters')
Truth is in Florida in the summer I could go outside in shorts, sandals, and a tee shirt - and I'm GOING to sweat. - I'd have to have an air-conditioned jacket to get around that.