Can I wear a mourning veil to my great aunts funeral?

Unfortunately, my great aunt has passed away. Her funeral is in 5 days and I'm not completely sure what to wear.
I have planned a simple black dress, with lace on the bottom of the dress and on the sleeves, it is knee length and the sleeves are half way down my forearm but my shoulders and chest are completely covered. Other than the fact that the dress is a little bigger around the waist than I would prefer, I'm not as unsure about my dress as I am about my hat/veil.
I have a gold hat with a black veil that covers my whole face. I've never been to a funeral, but I'm sort of known for dressing up for occasions. I'm not sure if it would be appropriate for me to wear the veil to the funeral.
I am related to the deceased, but I don't have any memories of her considering I was 3 when I last visited that side of the family. In addition, I've heard the sister-in-laws on that side of the family are pretty catty, I'm not scared of criticism from them but I don't want to embarrass my father.
Is it appropriate for me to wear a mourning veil to my great aunts funeral?