For starters, if this style of dress isn't in your comfort zone don't feel pressured to conform to it just because of the occasion/venue. Art/Design schools/departments (I'm assuming here) are populated with people far more concerned about expressing individuality than anything else oh the horror of being perceived as unoriginal and like someone else, so if that's LK Bennett for you no one will sneer at you, at worst someone will not take notice of your outfit all that much. You're far more likely to get strange looks if you're obviously uncomfortable.
However, if it's something you'd like to try and this feels like a good occasion for it then absolutely go for it. I'm not sure what size you are but I'd say with your shape it's probably worth looking into Scandi brands, Cos, &Other Stories, possibly try Weekday and Monki (more casual focused but they have the occasional gem) for the conventional high street brands. For something more special, look at things like Marimekko (this would fit the creative artsy bill very easily but it would be something you really need to feel comfortable in), Malene Birger (somewhat more conservative but if you're contemplating trousers they do some amazing shapes), Ganni (a bit younger, very fashionable at the moment), 2nd Day (edgier diffusion brand from Malene Birger), Totême (very minimalist but perhaps too casual).
Tictail (a sort of curated minimalist etsy) is predominantly Scandi based and full of emerging designers with really interesting pieces, the shipping and returns are a bit more of a hassle though. Vintage may work too? I'd just steer away from anything too period-specific.
Does it have to be a dress? I wouldn't rule out patterned separates, there's a lot of those out there at the moment and with your shape that may actually work in your favour in terms of fit. You'll also see more use out of them potentially.
Make sure to contemplate shoes and accessories carefully, with a statement look these are the things that make and break an outfit. The more minimal the better I would say.