@SandyY2K Why shouldn't they provide that? I appreciate that in this circumstance, the NRP isn't going to have a massive supply of clothes, so yes, should get access to what's at the mums.
But generally speaking, NRP's should be providing everything the child needs while at their house. Clothes, underwear, toiletries, food. That's absolute basics. The child shouldn't have to have their belongings carted back and forward. As you say, it's enough moving between houses themselves.
It also means the NRP can wash and iron clothes while the dc isn't with them. Or should that also all fall to the NRP, to have everything ready for next handover?
My ex buys some clothes for dc. Ultimately, the clothes end up between houses, but they're all his clothes and he has a number of outfits to wear between the two homes without packing up every time he moves between us. He is capable of buying clothes his child likes.
It's not petty. It's expecting the NRP to act like a parent, not a childminder, and letting the kids feel at home, as opposed to like a guest.
The RP's I personally know expect nothing less for their children. And luckily, the NRP's provide nothing less.