Hello Delly. On our site for British expats living in Tunisia, there is an expat called Kate who hires wedding dresses, some of them traditional. You can find her selection on the following link :-
http://www.nomarmiteintunisia.co.uk/...ingdresses.htm
(scroll right to the end for the traditional ones.)
Her contact details are on the following page :-
http://www.nomarmiteintunisia.co.uk/...anweddings.htm