It sounds a bit funny at the first moment - but in the Sahara it is mostly a bit windy and your skin will dry out completely within a short time, when you will not cover your arms and feet completely.
I had my winterjacket with me, stuffed with feathers inside and it was a perfect insolation against the hot sun !
At night it will be rather cold even in the Sahara, so you really should have some warm clothes and sleeping-bag !
Photo Equipment: It might be a good idea to have one of these special lenses with a built-in mirror, that gives the local people the feeling, your camera is pointing somewhere else, while you taking some pics of them...
(It will need some experience, and will be a severe problem, if they find out !!)
Luggage and bags:
Light weight day sac for carrying camera, water etc.
Travel lightly especially as it can be fiecely hot mid day mid summer, and the paths are quite uneven
Clothing/Shoes/Weather Gear: Sturdy shoes for walking around the Ksar - there are some loose stones etc. on the way upto/down from the granary, with some rocks to negotiate at one point.
I was pleased that I'd brought my walking pole with me - my knees are a bit dodgey!
Loose clothing. Not a good idea to wear skimpy tops/shorts etc as you are walking around a traditional village, even though the locals are used to tourists - dress respectively, and you might get better service/ better prices in the shops etc..
Hat to protect from sun
Toiletries and Medical Supplies: Sun protection, lip salve, plasters etc
Carry any medication you might need- I think the nearest pharmacy would be in Ouarzazate, but there might be one nearer.
There are some steep climbs, so those with breathing/cardiac / mobility problems should be prepared - it's do-able, but take the usual precautions
Photo Equipment: As much as You can carry!! Plenty of photo opps.
The shops near the Kasbah hotel have a limited stock of films, batteries etc.
Protective bags etc, it can be sandy/dusty
Camping/Beach/Outdoor Gear: No beach, and I don't think camping is allowed
Miscellaneous: Binoculars for views from the granary etc.
Cash - there are no ATMs here!
Bottled water - it's easy to get dehydrated
Bubble wrap to protect any artwork You buy