I had a bit of this.
Peremptory emails asking me to ensure the dc had 'smart clothes suited for a photo shoot', 'walking boots' or 'costumes for World Book Day'.
Plus an itemised list (which he would critique on arrival & ignore on departure, if he'd taken a fancy to keeping something, or couldn't be arsed, or just fancied yanking my chain a bit by making me ask him to return brand new trainers or an entire PE kit or an expensive coat or a beloved Teddy...).
It didn't take me very long at all to wise up - I took to saving everything slightly outgrown or tatty for visits, so if it never returned, I'd been saved a trip to the charity shop or recycling bin. & I'd send one change, unless I'd been having a clear out anyway & had stuff to get rid of.
Oh & get the dc to do the lists (or just don't bother).
Xh has been no trouble in this respect for years. The dc are now teenagers & responsibility for packing is with them. Xh knows he won't get any joy out of poking me if they don't have enough underwear or their swimming kit or whatever the fuck...he can nag them about it or go shopping.
I recommend it. It's your job to dispatch them to him with clothing on their backs which is appropriate for their journey. That's it.
It gets easier!