I've been browsing photos of people I know who graduated last year to decide if black was really the right colour with the gown. After some consideration black is not at the right colour, it looks very drab and bland, because the cloak itself is black. Black patterned is okay but white, is even nicer! But, it needs to have a V-neck collar or strapless. so here are some new considerations;
Lipsy
both asos
both boohoo
Not quite white but SO beautiful
Monsoon
It's a lot harder to find white dresses so it's a good job I've still got a fair bit of time!