I want to weigh in with a big YES on a linen kilt jacket. Your excuse for dressing differently from the Groom is that you are 1) older and less able to carry off the Jacobite shirt and 2) You don't want to intrude on his territory as the Guy in the Kilt Shirt. Never mind that you might or might not want to wear one some other time.

Poke around and try to find a dark blue linen jacket. Maybe something like this:

http://cgi.ebay.com/GOOUCH-NAVY-100-...item5ad310a121


I have no idea what your tight budget is, but I know that the Father of the Bride has plenty of financial demands, so I am not urging you to go crazy. If you find a slightly informal looking jacket, it may have patch pockets, which is a very good thing. It doesn't really have to be navy- it could be forest green or sand colored. Whatever you can find, print out the thread on converting a jacket and see about doing that with your linen coat. If your coat is lightweight enough, you can even omit the vent in the back. Consider some low key ( and low cost) bone colored buttons. You can put silver square ones on later if you decide you really like the jacket.

Otherwise, I believe you have received enough consistent advice above to decide for yourself what to do. The kilt will be cool ( a breeze will find its way to you) and by all means, wear a cotton shirt and a cotton undershirt. Remember, your precious child thinks enough of your marriage to try it out for herself. Good Luck.
M'll