um, do you not like your husband??
cause on your current path your future looks something like this.
You will be poor. Every year you will notice thousands of dollars vanishing from your bank account and windsurfing equipment turning up in the shed that looks the same as last years gear...well maybe a different colour.
You will be lonely. Unless you decide to windsurf as well - read twice as expensive - you will not see him in the afternoons and weekend during summer. He will also not commit to any more social events for fear of missing a good seabreeze, and may well leave family gatherings - yes even Christmas day - to get his fix.
He will be moody. This mood will last most of winter, except on the odd occasion he gets out in that steamer you bought him so he can now sail year round.
You will no longer drive a nice car. No you are destined to own a rust riddled, salt water bathed van capable of holding all the gear he needs to fuel his passion. Actually it will become an addiction.
On the up side though, you didn't think of getting him a kite which entails all the above and a need to be the centre of attention and wear boardshorts over the top of any other apparel at all times.
Don't say you were not warned

Jokes aside, head to your nearest windsurfing shop and get some sound advice on what gear he might need. Maybe even buy him a lesson or two for Christmas. Buying the wrong gear is both an expensive and very frustrating mistake, which will most likely end in turning him off the sport for good.