Well, he wears RBNY shorts. OK, he has been photographed wearing RBNY shorts. And this is at least the third time he's been caught on camera in Red Bulls' gear.
Tomlinson and his band-mates had a kick-around in Red Bull Arena in 2014, in the club's blue-and-yellow away kits:
Back in 2013, when (most of) One Direction visited Red Bull Arena, they picked up red-and-white kits - and you could kind of tell Zayn was on the outs, with hindsight.
But Louis stuck with the band, and seems to have stuck with those RBNY shorts. TMZ has the evidence:
Louis Tomlinson to Girlfriend -- Let Me Get That Bikini Top For You (PHOTO) https://t.co/741aEUUdTh— TMZ (@TMZ) May 13, 2016
If the club has a branded bikini top handy, Danielle Campbell might have a use for it.
Louis in Mexico yesterday! pic.twitter.com/Ay1ikR5V6e— 1DSupport #Home (@1Dstream) May 12, 2016