Interesting subject - perhaps these things too could be analysed:
1. Role of women in buying-decisions in a household:
--> Women focussed products
--> Products for whole family.
--> And yes, even in male-focussed products.
2. %age of (total household) income they are allowed to spend independently and the %age they've a say to spend - data would vary region-wise and class-wise.
3. Trends in past few years.
4. Spending patterns, proportions.
5. A comparison to other countries.