How can I convince my mom to dress up more?

My mom moved to Florida a year ago.
I just went to visit her.
During the week that I was there, all she wore was a pair of birkenstocks and a sarong wrapped around her body under her armpits. She has a few of them, but it’s all she wears, even when we go out.
One day we went to a restaurant, it was chilly inside, and I realized from her nipples pointing out that she does not wear a bra under them, and I did not once saw a panty line, so she is probably also going commando.
I finally commented that I was surprised she was wearing only a sarong around, and she said everyone does it.
I am afraid one of these days it will come undone and she will be naked in public.
What else can I tell her?

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