What type of jacket are you thinking of? With only a few weeks to the wedding you're looking at an off-the-rack; there's no time for a custom-made. I've dealt with B&S and can say they're very good. They can do the adjustment - but I can't say how long that will take - and have full rentals (if you'd like to save your money until you have time to get a made-to-measure jacket), and they sell everything you'll need. (They are 45 minutes north of the 401, just off the 400.)