Seapebble
It's gorgeous and you look lovely! If you think you might fret on the day, why not ask just to make sure there isn't a colour scheme? Otherwise go for it and be proud of yourself. I wouldn't wear the fascinator- they are very dated - not many women even wear hats these days to weddings. However, same applies- if you like it, wear it!
It depends what part of the country one is in to a certain extent.
Back in south-west England literally decades ago the thought didnt cross my mind to wear a hat and, as said, my dress I wore was a bit smarter than normal.
Cue for decades later and going shopping with mother of the groom here in West Wales (she's also from a south-west England city) and she asked around about the best place here to buy an outfit for her sons wedding and got a general recommendation to a particular one-off clothes shop. So off we both went to it and with similar specifications in mind for what she should buy to be mother-of-groom, walked in and virtually put our sunglasses on and realised there would be nothing we would want for her. That's when we realised that wedding clothes here don't seem to be "smart, understated" we were both picturing - they were bright colours, sequins, very glitzy compared to what we both had in mind.
Cue for there was loads of hats there and we could see that seems to be the norm here - so we did pick out one of the plainer hats in a subsequent visit there - after she'd had to buy the sort of dress we were picturing from elsewhere - so it was smart and elegant...but plain enough and not "hitting us both in the eyes".
So yep...the part of the country one is in does seem to influence the way people dress somewhat - so it may be a "hats area" there - where I wouldnt even think of it personally.