The White House’s State Dining Room, a grand and historic space that has hosted kings and queens, Nobel Prize-winners, military families and George Clooney, is not a room whose redecoration is taken lightly. Yet it gets a lot of wear and tear, with all those Manolo heels digging into the rug and martinis accidentally spilling onto the curtains.

After three years of work by Michelle Obama and the Committee for the Preservation of the White House, a new look was unveiled there Friday that will be a design legacy of the Obama years.

The major new statement is at the windows: elegant, sumptuously swagged striped draperies in bold peacock blue and ecru, suspended from thick carved, gilded poles. These colors should go very nicely, by the way, with the new Obama state china service in Kailua blue, unveiled in April.

The design of the 34 new stately mahogany chairs is based on chairs bought for the East Room by President James Monroe in 1818 from cabinetmaker William King Jr. of Georgetown. They are upholstered with period-appropriate horsehair fabric in a brown grid pattern, trimmed with brass nailheads. A blue-green rug, intricately woven with wreath motifs and oak leaves inspired by the stunning ceiling plasterwork, was installed in 2012 at the start of the project. A subtle yet stately feature of the room: the walls and detailed moldings, artfully repainted and glazed in several shades of white to highlight the architecture.

All in all, it looks like a room rocking an awesome new party dress.

“The room looks wonderful, a little simpler and a little fresher,” says Michael S. Smith, the Obamas’ Los Angeles-based interior designer and a member of the Committee for the Preservation of the White House, who worked on the project.

“Everything is streamlined, and there is a lot of historical gravitas here. Redoing a room like this we feel a very big sense of responsibility and the weight of history.”

The cost of the project — $590,000 — was covered by the White House Historical Association’s White House Endowment Trust, a fund administered for the maintenance and refurbishment of the White House public rooms.

The last time the State Dining Room was redecorated was in 1998, during the Clinton administration.

It was a collaborative effort by Hillary Rodham Clinton working with Kaki Hockersmith, the Clintons’ designer from Little Rock; Mark Hampton, the New York interior designer who had worked for George H.W. and Barbara Bush; and the Committee for the Preservation of the White House.

In that redo, the curtains were ivory silk brocade with a design of flowers, baskets and ribbons, and the carpet had a motif of leaves and flowers. The $341,000 bill was also paid for by the White House Historical Association’s White House Endowment Trust.

After 17 years, however, the rug and curtains were showing signs of distress.

“The drapery fabric seemed a little bit dated,” says William Allman, the White House curator. “At night it faded out, because the walls were stone color and the drapery ground was stone color, too.”

The official ceremonies, dinners and all the public tours take their toll.

“This room really takes a beating when people drop food or alcohol or who knows what on the floors,” says Betty Monkman, a former White House curator. “The sun damages the curtains. Sometimes, lots of people are standing and eating in there. The butlers are very good about picking things up off the rug, but they can’t go in and instantly vacuum while guests are there.”

The Obamas have unveiled a number of decorating initiatives this year, as the administration nears its end.

They include the new Obama state china and the redo of the Old Family Dining Room, which highlighted modern art and design.

Like many American families, the Obamas were looking for ideas on how they could use their ultra-formal dining room more often (even if it is perhaps the ultimate spot in the country to sit down to a beef tenderloin and spring vegetable dinner).

Allman says they decided to replace the large-scale chairs dating from the Teddy Roosevelt administration because their size made them difficult to use for entertaining. They were usually removed when there was a meal. “The goal was to make the chairs a little more user-friendly. The new chairs can be used at the main table or a variety of smaller tables around the room,” he says.

The new chairs, based on the Monroe model, were custom-made by Baker Furniture in Hickory, N.C., and the durable horsehair fabric came from Brunschwig & Fils.

As is customary, there were two identical 28-foot-by-43-foot wool rugs made by Scott Group Custom Carpets in Grand Rapids, Mich.; one is always in rotation.

The redecoration included two identical 28-foot-by-43-foot wool rugs, suitable for rotation. (John McDonnell/The Washington Post)

New chairs are upholstered in period-appropriate horsehair fabric in a brown grid pattern, trimmed with brass nailheads. (John McDonnell/The Washington Post)

Smith says the committee liked the patriotic feel of the curtain fabric: “We loved the stripes, and the fabric is made in Pennsylvania. They are a bit bolder; they feel a bit more special.” The valances, trimmed in bullion fringe, were inspired by designs from books of 19th-century drapery treatments.

“The first lady has a very good eye,” Smith says. “She is always very interested in two things: the practicality and functionality of something and, ‘Does it work for the White House?’ And second, ‘How will this work for the next family? Is this an addition that will make the house more usable and versatile for the short term and beyond?’ ”

Smith added, “The first lady is very aware of her position as the custodian of America’s house and its legacy. She inherited the house in very good shape from Mrs. Bush. She perceives her job as being to add to it and to move the house forward to the next family.”