I'm petite and I haven't had any issues finding either. Size extra small fits me perfectly.
I particularly like the Terry coaster skort, even though the grippers of the shorts stick out a little. I have a couple of different liners that I wear with the skort that don't do this. Zoic makes some nice baggies and their liners fit me well. I don't wear the baggies as often for cycling since I stopped mountain biking, but what I really like about these is that I wear them as regular shorts, without the liner for hiking.