Triathlon shorts or trisuits and no problem, at all. Triathlons are regularly held in the sea and you swim for a hour and something and then ride the bike for five hours without issue. Of course I do this in training, too, when a triathlon is nearing. Zero problems and zero chafing. Can even do a "bit" of running afterwards.
Regular cycling bibs will probably absorb water. The downside is that triathlon suits and shorts are less thickly padded, but I don't find the comfort to be an issue (perhaps drop the saddle a few millimetres to compensate if it is).
Last edited by Branko D; 01-23-22 at 02:20 AM.