Anthropologist Desmond Morris pointed to studies years ago that indicated that women wear clothes that show 20% or more skin when ovulating, and also dress in styles that are both more fashionable and revealing. At the time, I was skeptical of those, because there's an obvious reason for less clothing - women have higher temperatures when ovulating.

It appears that there is a link, however. As reported by CNN at this link, and as reported in academic journals at this link, women

"...dress to impress when they are at their most fertile, U.S. researchers said on Tuesday in a study they say shows that signs of human ovulation may not be as mysterious as some scientists believe. A study of young college women showed they frequently wore more fashionable or flashier clothing and jewelry when they were ovulating, as assessed by a panel of men and women looking at their photographs."