Before I answer your question I am going to make some observations based on my experience as a father watching my daughters grow up, as a nurse and as a trans woman.
My daughters would often push the boundaries with their clothing choices when they were growing up (honestly my oldest still does in her 20s). As their father I often got myself in trouble questioning their choice of clothing, I was out of touch or I just have no understanding of fashion, or everyone who s dressing Ike this. I had to often be careful of how I worded my response when they asked what I thought of their outfits. I was thankful that my wife often agreed with my assessment of their choices. His didn’t always change their minds however, it did at least give them an honest assessment of how there might view their choices.
The other thing I learned from being a dad to teenage girls, is that girls need to be mindful of how they dress and act around guys. If a girl is dressed in a provocative manner it does not give a guy an excuse for bad behaviour or sexual abuse, but a girl still needs to be mindful that their clothing choices can affect how guys will look at them. And as such a girl needs to protect themselves and depend on other girls to pull them up if they are behaving in a dangerous manner. As part of this I also learned that I as a 6’1” guy can’t fully understand the dangers that a 5’1” girl faces.
As a person who identifies as a trans woman, I need to be mindful that there are many things I never learned in life. I never learned how to dress feminine (that is something I am learning now). I never really learned how to coordinate outfits, or how to work out what was appropriate for what occasion. I learned male mannerisms (like sitting with legs splayed open) or not being mindful of the view down my top when I lean forward. Unfortunately many trans girls forget that this is an enticing view for most straight men. I also know that often (but not always) trans women tend to revert to an earlier age when they first start dressing openly in public. This is because as men we never got the opportunity to be told that we were pretty or hot. We might remember a time a hot girl showed us a bikini pic and want to experience that same level of appreciation. Eventually we realise that we are not a teenage girl and probably should not dress like we are, but like a young woman this something that will come with time either through advice from family friends or worse through unwelcome sexual comments or abuse.
Now as a nurse, I once had a colleague show some racy photos of herself when she was younger and a lot thinner. These photos were a combination of bikini pics, and topless shots of herself. Admittedly she did look good in them, however, I was very put off by being shown these photos, as were all of the other male nurses and Drs we worked with. It coloured how we viewed her, not because she had posed for the photos, but because she chose a professional setting to air them. When we care for a person they are vulnerable. It is a caregivers responsibility to protect their client or patient. And personal views and experiences should be kept separate from the care giving. I would personally be very offended by the behaviours you have described. The behaviours are wildly inappropriate and particularly with regard to showing bikini pics borders of sexual misconduct against a vulnerable person.
With respect to the others who have commented here, it needs to be understood that your duty of care is first and foremost to your clients. However, you also have a duty of care to protect yourself and towards your co-worker. I would suggest starting with a conversation about how her behaviours could be viewed. Use specific examples to illustrate how clothing choices is important to convey a professional demeanour and how overly sexualised clothing choices (remember specific examples) convey an unprofessional demeanour. Talk about how your clients already have difficulty discerning between right and wrong sexualised behaviour and how sexualised or revealing clothing blurs the lines between appropriate and inappropriate. I would then ask how she would feel if she was repeatedly shown images that she found offensive despite her expressing that she does not like them. Talk to her about how her same actions itch these two men borders on sexual abuse and puts both her job and her safety at risk. Above all else I would suggest involving another person in this conversation if you don’t want to escalate it to a manager than perhaps another co-worker. This person is thereto protect all parties to ensure that no baseless accusations can be made.
I agree that how she presents herself should be managed by supervisors, however, if there has already been issue than by speaking to her you could be helping her to grow while also protecting her job. If after speaking to her, she doesn’t change her behaviours, than you should escalate it to your supervisor.
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