I would say to check out Stillwater and USA Kilts.

If you are on a budget perhaps think about ditching the fly plaid it is VERY formal, I wouldn't wear one to my own wedding - something to consider. Forgo the hat, you don't need it and if you were to wear a plaid you could be heading towards looking like a characterture. IMO

Perhaps just aim for something simple, elegantly formal and classy, I.E. a kilt and prince charlie. Maybe have a look through this thread for formal dress ideas.