I think I'd love it - I look at the wedding gowns at the local thrift store all the time (until my SO shoos me away - some of them are so beautiful!) but I also think the nervousness and, yes, maybe even outright nauseous fear, would keep me from enjoying it as much as I'd like.
My two previous weddings were nervewracking - the first one: fairly large, traditional, etc. made me so nervous I was literally shaking in front of the alter. The second was easier, just family in my parents back yard (you have to pay for it yourself the second time around, my parents told me) but I was still nervous enough to want a second shot of bourbon just before the ceremony!
Both my wives looked very beautiful on our wedding days and I remember feeling happy and, yes, envious of them.