Voldemortified, my MIL is a genetically born MK disciple and what she does with her jars is she has a good stordì box white she pits them all in. Ad this box is a limited capacità , you have to take something else out before adding another, just like a kind of stock control so you assess the out of date stuff regularly. She also does this with cheese. It's quite simple, same principle as MK uses with long term paperwork.
Ohhelp, I agree that free space as you make it needs to be occupied by something in its category so it doesn't become the next place for komono. What I found when I made a wardrobe clear is that I put things I'd previously been storing under the drawers in there. In other words if you have some storage baskets/boxes somewhere in the house and not in a cupboard, e.g. wrapping paper, hairdryer, jewellery boxes ; then that would be a good time to move it and use the proper fitted storage to the max. Does that make sense?
Chaffinch are all your pants bringing you joy? I.e. Look good, comfortable, fit well etc? If so then maybe your drawer isn't the right size for them or something else is taking the space. On the bras I think I'd be tempted to donate to a first time mum who will inevitably have crap bras the first time round for pregnancy.