I think you look just fine as you are. If you're more comfortable with more of your traditional kit w/ the hose, sgian, etc then I'd say to go ahead and do it. After all, knives and sailing go together like haggis and 'taters!

I'd probably stick with sandals for sailing, personally. If not having hose and the sgian is a big deal because of the feel, you might consider wearing a diving knife strapped to yoru leg in the same place you normally carry your sgian dubh. The other leg would still feel bare, I'm sure, but that might be enough to keep you mentally balanced.