here on sale at Crave Maternity. They are nicely long enough for me (32 inside leg, so fine with flats but long enough should I ever be crazy enough to wear heels) over the bump but with adjustable thingy to keep them up
Not sure I'd have paid full price (£72 
) but for £28 they are pretty good. Really struggled To find black trousers that weren't boot cut and were long enough (and not already sold out)