You need to take him to court and force him to provide clothes at the very least for his child, to be kept at his house, her other home, if he does not do this.
Do not buy clothes or other stuff that she needs and send her with a suitcase.
You are going to need to step back and gather evidence that he is not providing adequate parental care for her while he is supposed to be parenting her. You are going to have to bite your tongue really hard, and sit on your hands instead of packing a suitcase.
Your child needs to understand that her fathers house is her home, not a hotel she visits.
If it is not her home - and a home is not a place you bring a suitcase to, and pack your atuff when you leave - then you need to take him back to court and get the 50-50 arrangement and its financial element thrown out.
Play a relatively long game here. Try to hold your anxiety about your child at bay while you force him to step up.
Let your child go to her father's wearing only the clothes on her back. If she comes back in the same clothes, having only worn them for the time she's spent there, take note. Do the same for the next sessions with her father. Take note again.
Then tackle him about the lack of clothes, by text or email. Insist he provide clothes, etc, for her at his house and at his expense, since his house is her other home, equal to yours in that regard. If he still won't, then inform him by text or email that you have been forced to send her with everything she needs, and start packing suitcases for her.
Then take him to court.