Eco balls get DH's work clothes clean and he often gets them quite dirty.
I hang clothes I have only worn once or twice back in the wardrobe and put jumpers back in the drawers!
I have a good sense of smell and definitely would know if an item of clothing smelt. DH wears his out of work clothes several times and they don't smell. If in the summer he sweats more then if I sniff his top it will most likely need washing.
Such a waste of electric and water to be washing all the time. Also makes me laugh that so many people wash clothes all the time but only at 30. I always wash them at 40 and towels and bedding at 60.
Also how do you all get all this washing dry? In good weather I hang it on the line but in the winter I almost always use my tumble dryer. No way am I having wet washing hanging on an airer in the house. Looks awful and makes loads of condensation. I know next door neighbour dries her washing indoors (she has 3 children so I expect has a lot of washing) as her windows are always all steamed up even if she has one slightly open.
Using less water and electric must make some difference even if only slightly. We chose not to have children, are vegetarian (I am almost vegan but do eat eggs), rarely fly (5 return journeys in 40 years and all short flights), use the car as little as possible.
By all means do as you want but don't then say you are worried about climate change and the likely future for your children/grandchildren.