I am very glad I found this thread. I have a beautiful tweed jacket that I purchased at Padraic O'Maille's (sp?) in County Donegal 22 years ago when on my honeymoon. (for anyone interested- that is the clothier that provided for the Movie- The Quiet Man), I digress. It has just been sitting in the closet begging to be worn. So I thought to myself-"self, maybe it can be altered to be worn with a kilt". So long story short I just today took it to an alteration place, along with my Argyll (as an example). So, here's the question- it has two vents- and at first I asked them to sew the vents up, but reading above, it seems better to leave them open. I just called to make that change, I hope I am doing the right thing.