Outfit for informal wedding

I expect the walk to the restaurant is not where chatter and photos will happen. Leave the coat till last. If it's very close I'd use one I had. Google the distance!

What about black trousers, a colourful top and a nice cheery red wool three quarter length coat/short jacket? Bright and warm for a cold time of year and you could always wear black ankle boots and warm socks too!

If you live in trousers varian, would you get much wear from a dress?
What about smart black trousers and a colourful blouse or longer line top?
Other guests will mainly see only your top half at the meal and you will have a coat over the top in the church.

Try browsing some online catalogues Varian.

Kaleidoscope
JDWilliams
Roman Original

These all show outfits which may help -or not. Good luck !

Thank you for all your suggestions.

I will need to buy a coat or long jacket as I can't wear my old wax jacket, office jacket, everyday padded anorak or the dreary old winter coat I wear for funerals. I will also need a dress as I normally live in trousers and none of my trousers are smart enough.

I normally wear a lot of black but my OH wants me to get something more colourful. I prefer dark colours, especially green, purple and blue (but not navy)

In general I like plain rather than fancy clothes but as I am in my seventies and a tad overweight, there is always the danger that I will look frumpy or lumpy or both. I feel I need a bit of understated style but I don't know where to start.

Either, as Maw suggested: smart trousers, jacket and knee length coat or
long sleeve dress, warm tights, ankle or knee length boots and warm coat.
Maybe a faux fur jacket? If you can still find one this late in the season.

Can you find out what are the bride and groom wearing, and how warm the restaurant will be?

A cardigan. A waterproof coat. Oh good lord, no,no,no ??

Each to their own, but a long waterproof coat is what I wear for dog walking!
I know OP said “informal” but ........

Ponchos do not get blown off - I regularly wear them, and a wrap, as an extra layer, can always be fixed with a brooch or kilt pin.

Wraps and ponchos get blown off in February - a very very warm waterproof long coat would be my choice

Smart trousers and jacket/knee length coat, smart ankle boots and a wrap or poncho for warmth outside.

Trouser suit?

What about a wrap or poncho, instead of a cardigan?

I would opt for a warm long sleeved dress, opaque tights and comfy low heeled shoes.
Have fun.

A nice/smart pair of trousers and a warm jumper/cardigan.
Especially as it`s going to be cold.