Those suede a-line skirts are fabulous if you're a size 8 fashion type with what the Daily Mail would call 'an enviably toned tum', who avoids all contact with liquids, sticky handprints, pets or public transport.
For everyone else most people, they're a walking dry cleaning bill with a straining second button that makes them hyperconscious of the small bumbag of chump representing the choice between fashion and crisps. And a last button that you will inevitably rip off while trying to stop your dog escaping/running for the bus/getting up awkwardly.
BUT they look great on models in Ali McGraw themed photoshoots thus grab M&S the editorial space they want, in order to remind the rest of us that we're running low on opaque tights and need to call in for some Percy Pigs on the way home.