There are some skirts on Isabella Oliver and also some on Asos and Next - also there are maternity 'before and after' dresses on Vertbaudet (I've just bought one) that have breastfeeding access as well as bump space - there's maybe 3 different styles on there. There's also one on Jojomamanbebe here.
I'm wearing my normal knee length skirts hitched right up above my bump and the waistband is on my rib cage. It makes them a few inches shorter but looks good with boots and thick tights. The added bonus is its warm and its really comfortable.
what size are you? i have a stack of very nice Formes skirts - denim / fuschia pink wool wrap over / pinstripe dk grey / black tulip - all above knee, size 10, winter wear. Wore the denim one afterwards too as has v wide soft waistband, was excellent post c-sec.