Possible Clues:

• Easter floor mat
• Back in Yachimata, traditionally under foot
• Floor covering is so long — 880 yards
• Woven mat
• Mat used in the Japanese tea ceremony
• One's floored by gallery's endless French china
• Kobe mat
• Teahouse floor mat
• Mat, do you call me cheap and shabby?
• Japanese flooring one stuck in middle of letter, Nancy's friend