I been in the habit for the last several years of wearing a kilt for all the high holy days, under the reasoning that it is appropriate to wear your best. I typically wear the purple heritage of Scotland for Advent, and my Keith tartan for Christmas (mostly green) and then the freedom tartan for Easter since the colors are pastel. I have had only very good response when I explain this is the best I have and I'm trying to coordinate the colors according to the church calendar.
We just changed churches and I let the pastor know that this was my habit, and was told that they welcome members to show pride in their heritage.
As other's have said, just wear the clothes; don't make it a look at me event. I sit where I always sit and don't make don't do things for the purpose of getting attention.