Is this ok to wear to a funeral?

[bunsbiscuitsandbread]

A friend died recently, not a close friend but someone I had lots of mutual friends with and who I would have smiled at/greeted if I bumped into them in Tesco.
I'm wondering about going to their funeral but I don't know if I have anything suitable and I can't afford to buy a specific outfit. I have a fairly simple black midi dress that has a pattern of tiny red flowers on it. Could I wear this with black denim jacket? I don't think this person was the sort to be overly fussy what people wore to a funeral, they had a great sense of humour and were always joking around. Or I have black jeans and could try to buy a black top to go with it? What would be best?

Your dress would be fine.
It doesn't sounds as if you would be a chief mourner, but will be sliding in at the back.

In my experience people make the effort to wear something sombre and respectable and it sounds as if your dress covers both.

sounds fine - not everyone wears black to funerals. Sober and sensible is fine.

That sounds fine

Absolutely, most people who are just attending a funeral don't buy a new outfit so the most dark & sombre outfit you have would be fine in my book.

Can we see a photo?