Would this be too casual for a funeral?

[CultureAlienationBoredomandDespair]

I’ve put on a fair bit of weight and am an 18/20 now. I need something new. It has to be suitable for breastfeeding and this hot weather.

Its MIL’s funeral and we were close, she would want black, smart-ish wear. It will be a catholic mass so I would wear a cardigan (or possibly blazer) over and I was thinking of these shoes.

Very sorry for your loss.
This is really nice . And so lovely that you are respectful to what your MIL would want.
it's Perfect with a jacket for the mass. Is it a burial? If so you might want a pair of pumps to change into depending on the weather, shoes get mucky/grassy / wet at cemeteries ime even when it's been relatively dry.

Thank you. It will be at a church (which is quite modern, so no flags or cobbles) and then the crematorium.