In reply to Bib_Bob_Euroslap:
I would say that the kit and equipment found on a general Scottish winter mountaineering kitlist would suffice, although add good down and warm boots (plastics are not overkill). If you are not sure what that entails, then I would recommend trying to fit in a trip to Scotland before you head out in March.
Essentially, you need good layers that will keep the wind out (it can get very windy); and layers that keep you warm (it can be very cold). Rain is not such a problem in winter, but is not unheard of!
In terms of what that looks like, it's up to you: layering system or Buffalo. Both have their advantages and both are seen out there.
If you hire crampons in Morocco, ensure that you check them over thoroughly and that they fit your boots before leaving the shop. Don't assume that everything will be fine and then have a surprise when you pull them out on the mountain for the first time...
Lastly, from what I have seen, lack of fitness and hygiene are perhaps the main pitfalls in the High Atlas. Give yourself the best chance and get properly fit before you head out. It's not a walk in the park approaching 4,000m for the first time, nevermind the refuge at 3,200m (although it does depend on the individual).
Also, keep alcoholic hand gel with you at all times. There are lots of bugs and germs kicking around, and it's really easy to pick up a stomach bug, which can ruin your trip.
Otherwise, enjoy - there's good snowcover and things should shape up nicely for March and the spring.