Can I wear a kilt on my cruise?

You can if you want to. People do.
I've seen loads of people on a formal night wearing their full tartan regalia proudly boasting how these have been their clan colours for the last four or five hundred years -
Except, sorry, they haven't.

Are Fred Olsen trying too hard?

First off, I like Fred Olsen. I like their ships, (well the Balmoral); I like the atmosphere onboard; I like their staff and normally I like the way they operate, but just lately it's started to feel that Fred Olsen are trying to be something they're not.