I refused to buy anything new for Halloween this year for my kids, told them they had to make do with what they had. They will manage that I'm sure.
We (in our family) all have lots of clothes, (husband loves shopping much more than I do!) but I never throw anything in the bin, unless it is beyond repair (tights, for example).
When clothes get too small for the kids, or my husband / I have a clear out, we always take to the charity shop.
I've never bought clothes for myself from the charity shop, tbh, but I have for the kids when they were smaller.
I have dyed clothes before now, but don't have the time or patience to learn how to make my own clothes. I do have a sewing machine in a moment of madness, thinking I would learn, but I couldn't even work out how to use it!