So what does one wear to train a dragon? Apparently, a fur vest is a must.
Night Furry and Hiccup, How to Train Your Dragon (2010)
General Viking (inspired) garb is also recommended.Ruffnut, Snotlout, Astrid, Fishlegs and Tuffnut, How to Train Your Dragon (2010)
Okay, loosely-based-on-Viking-garb would be more precise. But hey! There are choices for both genders here; aren't I generous?