Hi Hannan hope that you are well! I must admit that the quality of clothes in Zara in Tunisia is really good and the clothes are quite expensive but you won't find the same thing in another shop.
I saw a really nice coat and it was 500 tnd but the quality was really good.
Another place where loads of people buy there clothes from is Zen but I doubt anything would fit me from there as I think that they come up quite small, quality not bad.
They also have Benetton in Tunisia I am not too sure if you are aware of this but I know that there is one in Nabeul.
Like Essem said unless you have to buy from Tunisia then I would prefer to also buy from here as most of the goods that are in Tunisia are made in Turkey and I am not saying that they are all bad quality but not something that will last unless you go to somewhere like Zara,unique really nice but expensive.
I buy sometimes clothes in Benetton in Sousse. There are also a few other shops with modern clothes in that shopping centre (SLIM centre) on the road to PeK.
And I have bought already a lot of descent jumpers and dresses in the local frip shops or on the frip markets.