Packing for a trip can be very stressful, knowing what to pack for the temperature or about the local customs while trying to fit it all into your case can be even more stressful.
Something like a linen shirt is perfect as it’s lightweight and will still keep you cool. Especially in a neutral color that you can throw over any look.
Trainers will mean you can walk around cities comfortably and may be better for cooler evenings, while sandals can be dressed up and better for warmer areas of Morocco.