Orthodox Wedding Attire (F)

I got invited to a wedding! I have some questions on what’s cool to wear. I normally never wear skirts/dresses (I actually wore pants to the vort, but decided I wouldn’t to the wedding to avoid potential offense) so I’m having a hard time figuring out what would work … I was thinking a black/dark blue skirt with some kind of top that looks decent with it + potentially a cardigan too.

Is wearing mostly black okay at a wedding? ^{Sounds a little dumb but I would normally go for brighter colors. I get that men typically wear mostly black since they wear suits.}

Are heels (closed toe) fine?

From my time around the orthodox community, it seems like skirts are almost always ankle-length but might be a little shorter, like calf-length. Is it okay to wear something between knee-calf if I wear tights to cover my legs?

TIA for any insight.