In answer to your Q. I would say everything here is expensive. If it is not costing you a fortune it'll be because it's junk. But..there is a market for it, so... Labelled clothing is more expensive than in Italy!! It is cheaper to purchase goods on the web and have it shipped in. Eg. A box of Shreddies breakfast cerial will cost £4+ here. Before some smart a£*se tells me, I know I don't have to buy such items!
Get you stuff from wherever it is you live BEFORE you come to Qatar.
Good luck.