I don't want an all white dress - recommendations please?

I want a white wedding dress with colour in it - like a coloured floral pattern. I'm having a medieval inspired wedding so am looking for a more boho design (I do not want a costume). I've seen some I like online but wondered if anyone knew any dress shops where I can find a variety of non-traditional dressesto actually try on (i would like the wedding dress experience). I'm willing to travel anywhere but preferably in the SW of of the UK. I am also plus size so would need to be accommodating in larger sizes (I'm currently a size 20 but have been losing weight for my health so will hopefully be smaller by the time my wedding rolls around but I'm not losing weight to specifically be able to fit into a smaller dress). So please, if you have any suggestions, I would love to hear about them! Many thanks!