Need help finding a dark black tie dress with arm coverage

[choccalocka]

please help me find a dress for a black tie do at the end of June.

I need to cover my arms and prefer dark colours.

Budget?

Under £700 would be preferable.

Absolutely loads on John Lewis, use the filters for evening / maxi/ sleeve length. Some examples (a few of them are pale colours as you can’t filter by dark blue, dark green etc)