I have a supposedly polyviscose, imported kilt. It's solid black. The advice I got before I washed mine was "just throw it in the machine, it'll be fine". So I washed it on a gentle cycle with a nice dollop of fabric conditioner in the rinse... and then tried to press it without basting (the only thing I can baste is a chicken). It is now shot to bits. It also seems to weigh less which I assume is the loss of the teflon coating due to the conditioner. It is lovely and soft mind. I wouldn't say it's unwearable but I wouldn't leave the house in it. Proceed with caution is my advice... and don't use conditioner.