Plant dyed socks - to make the colours last on your socks, make sure you are washing them on a gentle and cold cycle. Do not tumble dry the wool socks, be it merino or cashmere. Naturally dyes do fade and change over time, it's part of their beauty. But if you accidentally use bleach on them, let me know and I can re-dyed them for you.
Quilted coats - these can be washed on a gentle wash and cold cycle. If they have fur cuffs/collars, I would recommend not washing them and getting them dry cleaned or just spot cleaning as needed.
Handmade clothes - wash on a cold cycle and tumble dry on low. Unless plant dyed and then I would recommend not tumble drying them.