I have seen many variations of the midi skirt, so there are lots to choose from. Here are a few of my favs:
Asos Drapey Pocket Elasticated Waist Midi Skirt, River Island Brown Pleated Midi Skirt.
River Island Dark Red Midi Tube Skirt, River Island Purple Midi Skirt.
Topshop Colour Block Pleated Midi Skirt, Topshop Pink jersey Midi Pencil Skirt.
Topshop Stripe Full Midi Skirt.