I'd think the poorer a person is, the more they spend on their appearance. Women tend to have less money than men, and black women tend to have even less money than white women, at least that seems to be the case in the US.
(And yeah, hair care products might also be more expensive, but that's probably not all of it.)
I don't care much about my appearance, the only time when I do (have to) care is when I go to a job interview.
The less you can afford to have no job, the more you care about the impression you make.
And I think for many it is subconscious - they don't think they fear poverty, but they probably feel more vulnerable in general if they don't meet the requirements set by society.
Apart from this, though, this are interesting numbers.
If this is true, then why the fuck don't we use our power? In capitalism, being the main consumer is a lot of power.
We could threaten to go on strike. We could, for a time, only buy products that benefit women. (Food would have to be exempt, but we could try to prioritize fair trade products from women's cooperatives)
We could do so many things!