Hi Sandals,
I think it's great you dress for yourself and it's good to feel smart in an outfit, but I'm afraid I would have to agree with your friend, especially the black tights. You absolutely cannot wear black tights in the summer at a wedding! (anyway not too sure on the polka dot and lace tight combo) I would suggest if you don't want to go bare legged / tanned that you look at other tights such as Wolford, in a natural colour perhaps with a pattern (they do some nice ones that are clear tights with a single black line up the back seam, looks dressy) Those veins are something others won't notice, none of us have perfect legs. You have a great tiny figure so don't cover it all in black for summer wedding. Black court shoes would not really be suitable. I would go for a sandal also, not a black one maybe a bright colour to "summer" up the dress. I'm not sure of your age of course so maybe you wouldn't feel comfortable in a bright shoe and prefer the court. All in all the outfit while lovely and smart would need to be tweaked so you don't feel out of place at a summer wedding.