Surely people don't get het up about this sort of thing anymore?
Well yes they do actually. In the real world most people still want to demonstrate to the couple and their family that they are important enough to make an effort for.
It's only on MN where guests compete to show how little they give a shit about people who have dared to be uppity enough to assume they're so important people would be interested in them getting married in the first place.
As far as I can work out general MN wedding etiquette for the couple is that they need to get married in a public lav with 2 or 3 guests, no presents or reception with the bride wearing a used dish rag and the groom in a fourth hand tracksuit and rings made out of foil. And if the dish rag or foil comes from Sainsbury's rather than Lidl then they are clearly up themselves.
Apparently for guests the etiquette is that you must begrudge every part of the day, from the gift to £2 spent on a coke yet be extremely demanding and critical about what you get in return including food and entertainment and expect the bride and groom to source you accommodation in a five star hotel for 6 people for a fiver. All children should be dressed as bridesmaids and page boys (especially if they're not invited to be one) and adult guests should either dress in a ball gown or like the sort of tart who hangs around the gas works doing £20 tricks or like they're about to do a hard day's work spreading slurry or collecting bins.
Suffice to say I think most MN wedding advice is balls.
OP in your case I think the top and jacket are lovely, but I would suggest white trousers, skirt or jeans with a really dressy bag and nice accessories. That would look 'weddingy' and I think white is okay when it's trousers and the jacket is pink. Black trousers/jeans/heels would just look like you'd come straight from work without changing.