On 27 August there was the annual race to swim the Fuschlsee (Lake Fuschl, near Salzburg).
The distance is 4.5 km, more than I would like to try.
As a mountain lake, the water was cold, and wetsuits were obligatory.
Black was not obligatory.
Sorry, I do not know who won.
X-T1/50-140/1.4T/C.