From reading the available literature (ok, I Googled two sites…) it seems that normal clothing is perfectly anti-UV – if you hold it up to a light, and you can’t see the lightbulb itself through the material, then it’s blocking all the harmful rays. Secondly, that sun-block creams are better if the active ingredients are metals – zinc oxide or titanium dioxide – rather than chemicals.
So does an anti-UV bikini make sense? Only if the bikini is blocking the sun, and all the rest is covered with mineral-based sun-block. This brand is the French Les UltraViolettes and, as you can see, they give a girl/parent the choice between a sun dress, a bare-shoulder dress with spaghetti-straps, a long-sleeved tee shirt, a sarong/pareo, a one-piece costume, or a bikini (all UPF 50+). They have bows and frilly bits, but the colours and prints are rather boring and generic – still, there is a generous choice in the degree that the girl can decide to cover up – depending really on how much time she’s prepared to spend (or let maman spend….) spreading on the suncream….
(And the two Facebook links at the bottom demonstrate the attitude of the models: half look like dressing up in costumes is the most boring thing they’ve done in their entire lives, half have merry little smiles – then you realise it’s the same girl: the grumpy ones must be from the end of the session when little Marie was tired…)
[And some more from various collections by the brand (twins or Photoshop, the eternal question…)]