This year's Nacktrodelmeisterschaft (Naked Tobogganing Championship) in Braunlage just finished, and photos are popping up. I gather a lot of them are from British outlets, as jolly old England sent some contestants this year.
See
https://forum.oneclickchicks.com/showthread.php?t=105167 for links from a previous year. Here are some photos I found with some searches ("nacktrodelmeisterschaft", "nacktrodeln", "braunlage", "naked sledding", etc). The girl with violently red hair seems to be the Briton.