Yes @YesterdaysFuture -many women have PCOS, and women with PCOS don't get mistaken for men. (What is dressing' femme' ?- this is certainly not a common phrase amongst women) . We are women because of our sex regardless of our clothing choices.
Some misogynistic groups/ individuals have in recent years tried to remove female human rights to privacy, safety and dignity by comparing men who want to be women to 'women who have had mastectomies for cancer' or 'women who don't fit sexist stereotypes' as a cover to give men who say they are women extra rights that impact negatively on women as a sex. The memory that comes to mind is when a TRA Bristol University academic wrote a report stating that as some women have mastectomies due to breast cancer , men should be allowed to access female changing rooms as 'transwomen' - men who say they are women- are an example of 'non normative' women like women who have had breast cancer. It was one of the most offensive and misogynistic reports I have ever read, and from memory it was used by a few TRA organisations to try and end SS services for women.
The responses to this thread have made it clear how important it is for the law to confirm that if you obtain sex by hiding your sex, it is sexual assault/ rape, and this is a crime.
I agree with @Helleofabore that if transpeople use having a GRC as an excuse to hide their sex to commit sexual assault, it's a risk to everyone. It's of particular concern that some of these potential abusers try and access spaces for the opposite sex and where women/ girls are undressed and vulnerable.