Fly plaid question

[Norbydog]

I am attending a wedding this weekend, and the kilt I intend to wear was custom made. There was enough material left over for a fly plaid, and although I have looked all over, I could not find a brooch to go with it in my community and I did not have time to get on online.
Any suggestions as to how I can wear the fly plaid? I have heard about tucking it into the kilt, so it is across my chest, but I have yet to see a photo of that. I do not intend to wear a jacket, and I was hoping the fly plaid would make the outfit more formal.

Thanks.