Here's what I've found. Understand we march military so my mileage will vary, likely.
I'm donating my pants to another district. While my pants are older than theirs, for them to get an extra 150 pants that will be a big plus for them.
My crossbelts, cords, and metal will all also be donated. Haven't found a recipient yet, though.
Lastly, my jackets won't likely find a home. I'm going to pull the patches off all of them (we use them for a senior gift), then likely throw away the jackets.
Again this is very specific to us. You may not be able to do that with yours. Good luck, though!