I have conducted innumerable sessions on 'corporate dressing,' and here is my take on your query:
1. Salwar kameez should ideally be worn with a dupatta. According to me, it completes the look of the outfit—just as a tie completes the look for men's formals. Nowadays, many women do away with the dupatta because of the hassle it creates while traveling by crowded public transport. A simple solution would be to just fold and carry it while traveling and then wear it when one reaches her place of work. At the cost of sounding old-fashioned, I must say that the dupatta lends a certain dignity to the outfit.
Having said that, let me also elaborate that there are certain cuts and materials that lend themselves better to office clothing, and people should be aware of the dress code right at the beginning. I know of certain companies that have left no loopholes as far as dressing for work is concerned. Issues about dupattas, sleeveless, Indo-Western, flip-flops, and bea.
I will further add to it. In this case, it is an IT company. Otherwise, the dress code will also depend on the type and place of work. Nowadays, women are in production, and there, a dupatta or any other loose clothing becomes a safety hazard.
Regards,