Pattern: Dusky Leather Leggings

About 96s 0c on Beta · Horde (8 hours ago) and 10g 10s on Beta · Alliance (10 hours ago), from player scans. A vendor pays 6s 25c, so the auction house pays 14.6× more.

No. It is in Classic Era too, with the same item level, vendor price and stack size.

Sell it on the auction house. After the 5% cut a stack of 1 brings about 91s 20c there, against 6s 25c at a vendor.