I had to find a larger version of the picture to tell... but it almost looks like this Speedo Endurance Powersprint brief.
http://www.ebay.com/itm/SPEEDO-COSTUME-SLIP-ENDURANCE-05-362-7799-POWERSPRINT-END-6-5-BRF-AM-BL-/371452837333?var=&hash=item567c507dd5:m:moHDe1Fun0 eGwfBdRxKNQmw
I believe it was popular about 2-3 years ago. That was back when I was first getting into swimming and started shopping for Jammers.. I seemed to see this print on lots of results. Since it has been a while, this print seems to be harder to find, now.