I don't know a tweet about scuba gear but the good news is you won't need any formal wear, heavy coats or many shoes. We've experienced similar flying on a discount Swiss airline where we have to wear overcoats etc. to stay within our 44 lb. limitation, in winter! Now that is tough! I always take a large enough purse to put the curling iron, flat iron type things (anything heavy) in it. I've NEVER had my purse weighed. Maybe you can do something similar with some of your gear???