well maybe try phoning a local branch of river island, sometimes the shop actually continues the stock for a bit longer/ it might have been put in the sale? i know i've seen several in primark/tk maxx/h and m, but i know the spots are quite small. h and m have a really narvy blue silk shirt with large spots and i think they have a skirt in a similar material? OH also, urban outfitters kensington definiely have some spotty dresses, i think they're strapless though. try phoning them.