The silver encrusted brocade gown from 1968, with matching bag, had been estimated at about $5 000, but a protracted bidding war among several determined would-be buyers drove the price to about 70 times that, including commission.
The Wednesday sale, the third in a weeks' worth of auctions of Taylor's storied jewels, clothes, memorabilia and other items, was not marked by the freewheeling frenzy that prevailed on Tuesday, when her finest jewellery took in $116m.
But the $2.6m was still about 10 times the pre-sale estimate, owing to the Taylor cachet and also driven by competitive online bidding from around the globe.
Christie's said the sale set a record for a couture auction, although the evening's top lot was actually an Andy Warhol lithograph of Taylor which fetched $662 500.
"The couture was an extremely successful auction," said Andrea Fiuczynski, president of Christie's Los Angeles, who served as auctioneer.
The results, she said, were a testament to Taylor's iconic status, which she said is unmatched today.
"There isn't any celebrity now who does everything she did," Fiuczynski told Reuters, speaking to Taylor's work as an actress, activist, humanitarian, savvy businesswoman and style icon.
Taylor died of congestive heart failure in March at age 79.
Two other offerings soared past $100 000 - a Chanel ball gown and cape with shoes and matching bag, which fetched $134 500; and a Versace beaded bolero jacket emblazoned with images of Taylor in her film roles, which sold for $128 500.
A few pieces of jewellery included in the sale also commanded strong prices, notably a fish charm necklace estimated at $500 which sold for $30 000 and a pair of rock crystal and gold Gucci ear pendants, which went for $74 500 against an estimate of $1 500.
The Taylor auctions continue on Thursday with a memorabilia and fine arts sale. Online auctions of some 1 000 lower-priced items from Taylor's estate are running concurrently.
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