Let me clear out some more facts,war mongers better stay away from my post and only those can post who are interested to share something healthy.
--In sub-continent,for lot of cultures stayed together,that is why a homogeneous state was created to some extent, ie the cultures of different religions and sects adapted a partial property of one another,that is saris were adopted by few muslim sects and shalwar khameez by Hindus.
--Originally, Hindus and Muslims have different cultures,as religion is reflected in cultural values of a sect,in dominating manner,that is why ,difference is prominent,anyone who denies this fact is fooling himself/herself
We need to understand first,that how and when similarity is adopted by two different culture partially and why difference is still visible?here are the following factors:
--In Sub-continent,two types of nations lived mainly.
>Those who belonged to different land,ie Arab,Afghanistan,Persian,Aryans etc
>The resident class such as old Dravidian,hindus etc
Now how our culture was effected?
--The Arabs,Afghanis,Persians etc brought dress culture like Gharara,jabba etc,they settled here and thus their dresses promoted in India.
--Furthermore,those non-muslims who accepted Islam remained partially connected to their old cultural dress,like saarhi etc,that is why we can see today few muslim women wearing saarhi and hindus of Shalwar khameez
--Most prominently,those nations(eg muslims,british raj) who ruled India,their culture influenced to subject as well and as a result of which hindus adopt Shalwar khameez,pent shirt and vice versa etc following might is right pattern.