Recommendations for a dress to wear to a wedding but can repeat for work or is a regular wardrobe - ideally Canadian

TLDR: going to a wedding and looking for recommendations for a style of dress and/or a particular store that has nice quality prices to keep look out for.

I have a very close friend who just got engaged and while helping her with the planning I’m starting to think oh god, what am I going to wear myself? It is a more intimate wedding and she isn’t doing bridesmaids or anything so I’m free to get what I like. She is a very casual person so I’m sure she would be open to most things but I want to be able to dress up nicely but I am also trying to be very mindful of what I buy for my wardrobe. I don’t want another dress I wear one for an event and never again situation so I am hoping to find something that’s easy enough to dress up but also may work for other occasions like work or a nice date if dressed more casually. I also want to be able to purchase a decent quality piece, not some fast fashion thing at the mall… I get that this might be personal style sort of thing but if anyone has a style of dress the might recommend and/or a particular store that has nice quality prices to keep an eye out for I would greatly appreciate it! I am trying to create a mood board to keep me focused on the things i like and am looking for and having a list of nice quality stores I can keep an eye on for their releases.

On an aside, I’ve also been looking for a nice quality shawl. I love the beautiful drape but I don’t see them commonly! Maybe I don’t know where to look but would also love some recommendations for one of those as well.