I rarely see fabric put out in our UK charity shops. Although I may occasionally be lucky when I ask if any has been donated and they will rummage in their store rooms for me.
granny64 mentioned donating to prisons. Several of the UK prisons have schemes for inmates, both male and female, to learn sewing skills. Some now take commissions I believe. You may like to read about it.
https://www.theguardian.com/lifeands...itch-murderers