I have actually washed our clothes in the machine with no detergent at all, just plain water at 30 degrees. And amazingly, they seemed to come up quite well. Drying them outside in the sun brightens them up. It wouldn't do for my husband's working clothes, but maybe we don't need these chemical pollutants?

We like to change our underclothes each day, so that's why we both have about 6-10 of each item.

I'm wondering if I could get away with wearing no bra at all over the five weeks? I'm not uncomfortable without one, just a rather funny shape and a bit wobbly. I doubt if anyone would notice, and even if they did, I'm too old to mind much.
Many women in other lands and cultures don't wear the things. If it doesn't cause discomfort, perhaps we could discard them?