Is is a bikini appropriate attire for a preteen to go shopping in?

My wife and I took a short vacation to the desert Southwest in the middle of the summer and it was hot outside. We went to the store to grab a few items and noticed a mom and her two daughters shopping. The mom was wearing a cover-up but her daughter's around 10 and 7 we're wearing just their bikinis. Now they were pretty modest as bikinis go, but is this typical in warm climates?
Yes , whatever mom lets them wear
Its ok on a hot day
Should hve been in a one piece at least
No, they should have worn a cover-up like Mom
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Is is a bikini appropriate attire for a preteen to go shopping in?
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