Funeral clothing – help!

I’m not exactly an expert on funerals. I think I’ve been to three in my life… and for two of those I wasn’t even in my teens yet! As such, I have no idea what one is supposed to wear (other than black), and even less of an idea what one should wear as c lose family member who will have to shake everyone’s hands at the end! The last time I was a close family member at a funeral was my step mum’s, I was 12 and just wore what my mother had given me. So, dear readers, I need yourI help. Which of the following outfits is most suitable to wear for my grandpa’s funeral?

Exhibit A:

black dress

Or exhibit B:

black clothes

(Sorry, that photo is terrible! I hope you can work out what it’s meant to show anyway… basically it’s a long black skirt with a black, three-quarter sleeve blouse.)

I’m afraid the dress might be too casual, but the other outfit might be a bit too formal for a crematorium (the last time I wore that skirt was for an evening do!). Any comments appreciated!!