We always like to keep an eye on the supermarket ranges, not least because there are occasionally some retro gems to be had for not a lot of cash. This 1960s-style Daisy Lace Collar Dress at Asda for example, which is under £15.
A monochrome dress inspired by the mid-1960s, it has a lace collar to the front, an all-over daisy print elsewhere and keyhole detailing on the reverse. The length is (more or less) to the knee.
As we said, a cheap one too, selling for £14, with sizes 8 through to 24 online.