Honestly, in the midst of Summer, the scarf just looked ridiculous with a bikini. But when removed, her enormous ARCANNON was visible - and that simply wouldn't do. The most inexpensive back-slot item at the Trade Broker was a scuba tank - and scuba tanks and bikini's both go with water, right?
And yet you know how these things always escalate.
Because the straw hat, which went so well with the bikini seemed so out of place with the scuba tank, well...