Having never considered wearing maternity clothes (well not since I was pregnant) I stumbled upon these in Topshop in Oxford Street and thought why not give them a go. They're almost perfect, tight on the legs but roomy on the belly for my bag and essentially poo room (PR). Usually I have to go a size up to gain PR but that means my leggings can be baggy. I might have to get the waist band tightened as they slipped down a little without a big belly to hold them up, but they feel great on other than that. It has lead me to have a look online for other maternity wear that I think could work for me.
They don't have the big bulge,stretchy high waist of some maternity wear (that'd be a step to far for me) but if you try it and it works for you great stuff.