I had early troubles with clothing, too. At the time I was NCP, but my solution remains the same even until this day.
I noticed that my "supply" of clothing was slowly getting smaller over a short period of time and for the life of me, I couldn't figure out how the hell I was losing them! So, I asked. PEW told me that she was "throwing them out" because they didn't fit and were "several sizes too small." This is something that is common among people in similar situations and it's just as bizarre as all the rest. Fact is - they absolutely were not.
Of course, we argued about it with me telling her that regardless of how ill-fitting any clothes she sends them over might be, I wouldn't dream of just arbitrarily throwing them out under any circumstances - I would send them back to her and I expected her to do the same.
So, what I started doing was whenever I get them for my custodial period, I would take the clothes that they wore from her house to mine from the hamper when they got ready for bed and immediately wash & fold them. That's what they would wear back home. It didn't matter if I got them on a Friday night and were going home on Sunday night. With finances being in disastrous condition during the proceedings, I could ill afford to have her throwing out my clothing. I still do this today under the 50/50 arrangement. Take their Sunday clothes - wash, fold, and "stage" them, and that's what they wear back the following Sunday.
No more clothing problems.
Another interesting story related to clothing (which I think was deliberate) was after the whole debate over the boys watching World Wrestling Entertainment obsessively - for MONTHS when it was exchange time, they would be wearing WWE-related clothing... character t-shirt, show t-shirts, what-have-you. Both boys. Every... single... week... they would arrive wearing WWE clothing. I said nothing. All I could do was laugh. That, and camouflage clothing, which I never liked going well back into the marriage.
It's bizarre the lengths they will go to just to try to upset the apple-cart.

I'm against sending clothing and accessories back-and-forth. Each parent can and should be responsible for having shoes, clothes, coats, etc. at their house. The only thing you should have to concern yourself with is making sure that they're appropriately dressed for exchange day, not packing bags for them to drag back-and-forth.