Possible Clues:

• Participated temporarily, as with a band
• The Moody Blues' "Nights in White ___"
• Stain found in cloth
• 'Fine, but not outstanding in it (5)'
• Fine stuff for the week's end in this
• Notwithstood, in such a fine way - smooth, too
• Demonstrated it can provide material
• Demonstrated material?
• Like some weaves
• Material with glossy front and dull back