Anyone know nice wedding fashions for 86 y.o. grandma?

my grandma has 2 weddings. I'll be taking her shopping and want to find something that will look good. She's thinking dresses but I was thinking more like those suits the grandmother (Emily) wears on the gilmore girls. either way, does anyone know of sites to look around or fashion ideas for her? She's good for her age but is kind of hunched a bit from osteo, about 5 ft., 130 lbs. I'd just like us to have ideas going in since she isn't in any shape to shop for hours and I don't want us wasting times w/ Kohl's or lower quality. We live in Chicago-land Thanks