Harassment / G-String Legality

Is this g-string legal on Blind Pass beach (I think Sarasota County) http://www.amazon.com/gp/product/B009VLLIBE/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1? Lot's of people sit by me and I have never had any problem. But I was there yesterday and the maintenance/janitor was driving a 4-wheeler on the beach picking up trash (never seen him do that before). As he came down by me he was stopping and talking to other people. I overheard him say "I'm not the police but I am going to report him to the authorities". He stopped at a couple of people. Like I said nobody's ever said anything negative to me directly. I felt like confronting him and telling him to mind his own business. Should I confront this guy and tell him what I'm wearing is legal and to mind his own business? Should I report him to the county (he's a janitor after all)? What if the police show up what can they do, can they arrest me? What should I say or do if they show up? Do anybody know the nudity/beach ordinance? Thanks in advance.