Outfit for new partner's 50th

[eewwdavid]

I am having a panic attack just typing this....i jest..but I am crapping myself.
Big meal booked for significant other's birthday...first time meeting a lot of his friends. I am slightly older than him, and therefore than them. Especially so the "wives" who are a bit younger than his friends. They are quite stylish, i am not. DP is lovely and thinks I look lovely...i am in a state of abject fear.
What can I wear?!
Early 50s, slim 8/10ish zero cleavage. Not as toned as I used to be so would like to keep arms under wraps. Meal is in city restaurant will be hipster rather than formal i fear. I am clueless and would appreciate any suggestions.

Oh @EleanorMc67that sounds a wonderful job! You have such lovely taste.
I found a pair of sort of nude shoes last night, low heel, I'd forgotten i had them, so pleased! They should work with most things, but I'm also going to try out the clarks ones as I love the look of them.

And one thing I'm definitely going to do is a bit of calculated vinted shopping for things I'm obviously lacking! Then any future events will hopefully be less of a panic!

OP did I miss it, did you say what you are wearing?

was wondering the same!