'Walk-on weight'
Seems reasonable to travel in a coat with big pockets which you can load some heavy items into. The result isn't any different from accepting a 'large' passenger on board - and who's going to try and charge an excess for being fat?
I'm sticking my ski boots in my checked luggage next month and will put my skid-lid in my hand luggage. I did consider wearing it whilst boarding if I couldn't fit it in the ruksack, as it's just a form of hat - right? ;o)