A guy friend recently asked me "What's a full-body or full-length sports bra?" Not that he needed or even wanted one, but I'd been writing about them and he was intrigued. I'm glad he was comfortable asking and want you to know, you can ask me anything! I'll do my best to give a thoughtful but not-too-long answer.
(BTW, the answer to his question is: it's one that has the usual bra elements, but instead of ending mid rib, the fabric continues all the way to a woman's waist. This makes it more like a tanktop with a really supportive bra built in and is great for a little more coverage in the winter or if you want to be modest while wearing very little in the summer.)