Does this satin skirt wrinkle easily?

No, the satin of this silky skirt is very soft and breathable, I have washed it several times without wrinkling.

Does this mermaid skirt have an elastic waistband?

Yes, I am really appreciated the bit of elastic in the waistband to make a snug, just right fit.

Is this silky skirt could wearing in the winter?

Yes, as long as the wearer has warm undergarments. It is a little bit thicker satin skirt.Good for cool evening wear