I suppose best method might also hinge on why you need to dispose of your murder outfit. Is it because it is bloodied? Or because you fear other contamination if forensically examined (transferred hair, fibres, pollen, distinctive dust, mud/earth in treads of shoes)? Or simply because if seen, you want to be able to demonstrate you have no clothing of that type in your house?
Could you break your washing machine (and post about the breakage copiously on MN) and take clothes to a launderette where you can start off a load yourself, and then staff do the rest so you pick up a bag of clean, folded stuff? Maybe 3 loads (in different machines) over the course of a week/10 days? Wash your "guilty" stuff with your DP's, but the rest of your stuff and your DC's separately.
That would wash blood/residue in to someone else's machines/drains, and even though investigators would know you'd been there, so would scores of other people.
Then you would have clean enough clothing to recycle, and I think those kerbside "charity" bags would be the best way, ie the ones that aren't from a real charity but some sort of accumulator who makes a v vague claim about a proportion of proceeds going to charity) as they get taken to centres and redistributed (rags, bulk by weight/type overseas, some of the better stuff for resale). But you can never be sure when one of those bags will turn up. (I would say leave it outside someone else's house, but you might get picked up by someone's home CCTV).
OTOH, perhaps you can get too screwed up by fear of CCTV. If you suspect a long interval between act and it being noticed at all, then how easy is it going to be to trawl all the possible CCTV around you for several weeks. Especially if you go to visit someone you see frequently, who lives in an area with no ANPR and little CCTV outside their town centre?