I got married 16 years ago and now have two teenage DDs. I'm 5ft 3 and a size 10/12.
As a newly wed, I was also unsure what to do with mine. I dithered for a couple of years, then looked to sell it, hoping to get about 40% back as it was still current. I'd put it on ebay with Buy it Now or Best Offer options. Someone offered me £30. It was about £700 originally. I decided it wasn't worth selling, so I just kept hold of it.
The darn thing accompanied us through several house moves and was always in the way. I hadn't paid for it to be boxed and cleaned (more expense!) so it was just on a hanger in a cover.
Recently I heard about wedding dresses being repurposed into gowns for babies born sleeping. What a lovely idea! However I couldn't find anywhere that was accepting gowns.
I also thought about giving it to a prom dress bank (and it could be dyed) but tbh I don't really like the idea of young girls dressed up in this way, and thought a wedding dress OTT for a prom.
During the last clear out, I decided it was to go. My girls weren't interested in it. I didn't try it on again. I posted it to Oxfam so I didn't have to see it in a local shop window.
If I had my time again, I'd have sold it straight away to recoup some of the outlay. It's just a dress. I have the photos and great memories of a wonderful day that was only the beginning of a journey. I wear my engagement and wedding rings every day; as material objects go these are what matter to me. I also have a wonderful DH and two beautiful DDs who bring me joy every day.