Mostly it depends on each person, whether some women are economical or some are not. The same is the case with men, for example, men have many things to watch outside their home, they have to manage things in their office, they also have to buy some things for themselves, etc. All these things should be kept in mind that men work hard for only their homes and their needs.
This statement is as we cannot say that man are not economical because almost every man work outside the home and don't spend money which is not necessary and save every penny for giving a better life to their families. Man just work for the sake of his children, wife and family because all he wants is the happiness of his family.
As you said women are economical, in this case, women bought the most clothes than men, women spend most of their money on glossaries, etc. The money that they use on these things is also for their husband. So, all these things lead to non-economical. But this is just my thinking, I won't say all of them are the same but I have noticed like this before.
In most of the cases women spend more money in useless activities but there are also many examples in which women spend their lives according to the salaries of their husbands and I think buying of clothes is necessary for life but buying numerous clothes enters into the category of non economical. I think women and man both should have trained theirs selves to live in every situations no matter how much your salary is because if you cannot live in less salary then its your fault so always be economical in every situations no matter you are man or women as unnecessary buying is not a good addiction.