I'm going to my dh's Christmas party where the dress code is a kind of dress-to-impress/party glam type thing. I've got a LBD which is fairly short and I definitely need to wear tights or hold-ups with it as my legs, whilst long and slim, are really pale and prone to looking bruised and/or veiny (nice!). I think opaques or footless would look too casual so I'm thinking of black in a mid-range sheerness - is that a no-no or OK? I'm anxious to avoid looking like a granny but I don't know what else would work...