alnasr street is filled with tailors..if u have a sample of blouses and jackets it would be beter to take it to the tailor u choose.. however,you dont really need a sample 4 the skirts and pants, coz they do a good job in that..

but seriosly i take a sample of whatever and they can copy it exactly..
i recomment Nawras alkhaleej, Al-athma.. just to let u know they are all indians and pakistanis..

if ur looking for a mall thats filled with tailors, theres algarafa complex located next to dasman supermarket.. both philipinos and indians are the tailors

designers are more expensive, they are mostly in saad street, these do a more professional job in evening dresses haute cauters, fancy stuff, the tailors are mostly gay philipinos LOL but they really do a good job, expensive though..
i usually go to Alsaafa (just before royal plaza)
also valentino which is before qatar national bank

if ur looking for a unique evening dress ,ofcourse go to the lebanese designers, they have amazing taste..
there's Robert abi nader located inside saad plaza
i'll get back 2 u bout the lebanese designers, i cant remember the names

it all depends on what ur looking for :)
i hope i helped..