Investors appeared to be upbeat about holiday retailing on the last full trading day before Christmas.

The S&P 500 Retailing Industry Group was up 0.4 percent to 935.84 today, just below the 0.5 percent advance registered by both the Dow Jones Industrial Average and S&P 500, which ended trading at 1,827.99 and 16,294.61, respectively.

U.S. markets will have an abbreviated day of trading Tuesday and are scheduled to close at 1 p.m. for Christmas Eve.

Twitter Inc. and Facebook Inc. jumped 7.6 and 4.8 percent, respectively, to $64.54 and $57.77, while Pacific Sunwear of California Inc. logged the largest increase among U.S.-based retailers tracked by WWD,  a 7.4 percent advance to $3.50. J.C. Penney Co. Inc. moved ahead 5.5 percent to $8.78.

In the WWD sample of retail, fashion and beauty stocks, decliners were outnumbered by advancers by about a two-to-one margin. Jos. A. Bank Clothiers Inc. and The Men’s Wearhouse  Inc. shed 1.3 and 0.7 percent, respectively, to end trading at $56.29 and $51.63. Before trading began Monday, Bank said it had rejected MW’s offer to acquire it for about $1.54 billion.

Tiffany & Co. shares surrendered 0.1 percent of their value, landing at $90.50, following word that it had ordered by a Netherlands arbitration panel to pay Swatch Group $448.6 million following the contentious end of the two companies’ venture to develop Tiffany watches. Swatch shares rose 0.8 percent to 586 Swiss francs, or $653.98 at current exchange, on the Swiss exchange.

Major European indices all finished the day with gains, with London’s FTSE 100 gaining the most, up 1.1 percent to 6,678.61.

The DAX in Frankfurt rose 0.9 percent to 9,488.82, while the FTSE MIB in Milan rose 0.7 percent to 18,697.15 and the CAC 40 in Paris closed up 0.5 percent to 4,215.29.

However it was a more mixed day for fashion, luxury and retail stocks.

Those that notched up gains included Aeffe, which climbed 6 percent to 0.67 euros; Hennes & Mauritz, which rose 1.5 percent to 296 Swedish krona; Compagnie Financière Richemont, up 0.9 percent to 87.70 Swiss francs, and Tod’s, which rose 1.4 percent to 120.30 euros.

Declines hit Brunello Cucinelli, down 1.9 percent to 25.59 euros; Geox, which fell 0.7 percent to 2.63 euros, and Ferragamo, down 1 percent to 27.53 euros.

The pound traded for $1.63 against the dollar Monday, while the euro went for $1.34, the Swiss franc for $1.11 and the Swedish krona for $0.15.