Are you talking about the Summer Sai outfit? If so that already happened during that Ino Flower Recharge Event like 2-3 weeks ago? It was only 1 per server, or "merged servers". It hasn't come out for purchase or any other method just yet.
PS. I have it. 
Don't bother buying the clothing, it has the same stats as the kimono for price that is much higher. (Just for different attributes)
Imo, buy wild west/kimono instead.
Clothing all stacks. Stats stack on top of each other and they apply to all of your team. Which one you have on does not affect your battle power. Jib already confirmed that it applies to your team, not just your main. And I can confirm they all apply. I have all of them unlocked other than the ST clothing. Changing between any of them has no affect on my current BP.
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