That Texas Lady is talking about concealed carry in a bathing suit… from a woman’s perspective of course.
Now granted she is wearing a cover garment, but it just goes to show you that you can indeed carry a heater (and a backup knife) while wearing a bathing suit if you feel the need. In her post she demonstrates a couple of carry methods that would allow even a woman to carry concealed and not look out of place at all while at a public pool or a beach.
I will say that while her demonstrated methods do indeed get the job done, I think that you would be better served just using off body carry for the firearm. People think nothing of someone at a public beach or pool bringing a large bag/backpack/cooler with them and any one of those would work out perfect for off body carry of a firearm. Make use of a Gunvault Micro Vault or the more affordable Nano Vault to keep the firearm secure and you can have a full size handgun within arms reach at all times. I think that off body carry would work out just fine for about 99% of scenarios that you might run into in those situations.