Halo I'm glad my words helped a bit, and you, obviously, got your sister's answer! Perhaps you can keep one of her items that you can wear joyfully? I kept a scarf of my mother's, which is typical of the colours she liked and I like wearing it. I'm sure your sister would be happy for her clothes to go to a charity shop, bringing happiness to others, who will love them. There's a lot woo psychology hidden in MK's book! 
Unless your 2 suits are pure classics, in style, colour, and fabric, don't count on passing them onto your DDs! Fashions change quickly! It's almost guaranteed that they either won't want them, or one will be working in racing stables and the other in the Forces! 
Or they will feel obliged to take them, and the suits will clog their wardrobes, unworn, because they will be afraid of hurting your feelings by donating them! 
Odd bits of komono tend to be small, quick successes - useful when you're pushed for time or just irritated by them. Some people allow such things to collect in separate boxes, until the whole of each komono sub-category is all together, for sorting, unless you know needs discarding anyway.
What a brilliant surprise to end up with all those empty boxes! Well done! I wish...
Sorting out discards and getting them out of the house is an important key to success. Try to recognise how much you can get done in the time you have (don't over-estimate!) Break the task into bite-size chunks, even if you have to sub-divide sub-categories. Pull out less than you think you can manage, and put 'keepers' in a box/bag, until you have time to do the rest. When you have worked through the whole drawer, shelf, or cupboard, it will be clearer where the keepers will best be stored. The solution will find you! 
Sometimes OPs have found that the place to store a particular group of things is quite different from where it 'has always been kept'.
Everything will gradually become much clearer, when you reach the 'tipping point' and see that kondoing is really working. The magic moment!