What is a "smoking jacket"?

A smoking jacket is a type of loungewear worn by men that is typically made from luxurious materials such as silk or velvet. It was originally designed to be worn while smoking a cigar or pipe, as the jacket's heavy material helped to absorb the smoke and protect the wearer's clothing from the odor of tobacco. The smoking jacket typically has a loose, comfortable fit and is often adorned with decorative details such as embroidered patterns, braided piping, or contrasting lapels. The jacket may have a belt or sash to cinch the waist, and it may also have pockets for holding tobacco and smoking accessories. While the smoking jacket was once a popular item of clothing, it is now mostly considered a vintage or novelty item.