When the Seahawks debuted in 1976, the team's logo was a stylized royal blue and forest green osprey's head based on Northwest Coast art. The helmet and pants were silver while the home uniforms were royal blue with white, blue and green arm stripes. The road uniform was white with blue and green arm stripes. Black shoes were worn for the first four seasons, one of the few NFL teams that did in the late 1970s. They then changed to white shoes in 1980.
In 1983, coinciding with the arrival of Chuck Knox as head coach, the uniforms were updated slightly. The striping on the arms now incorporated the Seahawks logo, and the TV numbers moved onto the shoulders. Helmet facemasks changed from gray to blue. Also, the socks went solid blue at the top, and white on bottom. In the 1985 season, the team wore 10th Anniversary patches on the right side of their pants. It had the Seahawks logo streaking through the number 10. Starting in the 1989 NFL season, jerseys were no longer sand-knit. In 1994, the year of the NFL's 75th Anniversary, the Seahawks changed the style of their numbering to something more suitable for the team; Pro Block from then until 2001. That same year, the Seahawks wore a vintage jersey for select games resembling the 197682 uniforms. However, the helmet facemasks remained blue. The logos also became sewn on instead of being screen-printed. In 2000, Shaun Alexander's rookie year and Cortez Kennedy's last, the Seattle Seahawks celebrated their 25th Anniversary; the logo was worn on the upper left chest of the jersey. In 2001, the Seahawks switched to the new Reebok uniform system still in their current uniforms, but it would be their last in this uniform after the season ended. Previously, the team's uniforms were made by Wilson, Wilson/Staff, Russell Athletics, Logo Athletics, and Puma.
In March 1, 2002, to coincide with the team moving to the NFC as well as the opening of Seahawks Stadium (which would later be renamed Qwest Field, then CenturyLink Field), both the logo and the uniforms were heavily redesigned. The Wordmark was designed by Mark Verlander and the logo was designed by NFL Properties in-house design team. The colors were modified to a lighter "Seahawks Blue", a darker "Seahawks Navy" and lime green piping. The helmets also were changed from silver to the lighter "Seahawks Blue" color after a fan poll was conducted. Silver would not be seen again until 2012. The logo artwork was also subtly altered, with an arched eyebrow and a forward-facing pupil suggesting a more aggressive-looking bird. At first, the team had planned to wear silver helmets at home and blue helmets on the road, but since NFL rules forbid the use of multiple helmets, the team held the fan poll to decide which color helmet would be worn. The team had usually worn all blue at home and all white on the road since 2003, but late in the 2009 season, the Seahawks wore the white jersey-blue pants combo. The blue jersey and white pants combo has been worn for only one regular season game, the 2005 season opener at the Jacksonville Jaguars, while the white jersey and blue pants combination has not been worn regularly since late in the 2002 season, with the exception of late in the 2009 season. In 2009, the Seahawks once again wore the white jersey and blue pants combination for road games against Minnesota (November 22), St. Louis (November 29), Houston (December 13) and Green Bay (December 27).
The Seahawks wore their home blue jerseys during Super Bowl XL despite being designated as the visitor, since the Pittsburgh Steelers, the designated home team, elected to wear their white jerseys.
Since the Oakland Raiders wore their white jerseys at home for the first time ever in a game against the San Diego Chargers on September 28, 2008, the Seahawks are currently the only NFL team to have never worn their white jerseys at home.
On September 27, 2009, the Seahawks wore lime green jerseys for the first time, paired with new dark navy blue pants in a game against the Chicago Bears. The jerseys matched their new sister team, the expansion Seattle Sounders FC of Major League Soccer who wear green jerseys with blue pants. On December 6, 2009, the Seahawks wore their Seahawks blue jersey with the new dark navy blue pants for the first time, in a game against the San Francisco 49ers. The Seahawks broke out the same combo two weeks later against the Tampa Bay Buccaneers, and two weeks after that in the 2009 regular season finale against the Tennessee Titans. In December 2009, then-coach Jim Mora announced that the new lime green jerseys were being retired because the team did not win in them, because he liked the home jerseys better, and added that the home jersey is a better match for the navy pants. In the same press conference, he stated that the new navy pants "felt better" on players as opposed to the Seahawks blue pants. For the 2010 season, Seattle returned to the traditional all "Seahawks Blue" at home and all white on the road.
On April 3, 2012, Nike, which took over as the official uniform supplier for the league from Reebok, unveiled new uniform and logo designs for the Seahawks for the 2012 season. The new designs incorporate a new accent color, "Wolf Grey", and the main colors are "College Navy" and "Action Green". The uniforms incorporate "feather trims", multiple feathers on the crown of the helmet, twelve feathers printed on the neckline and down each pant leg to represent the "12th Man", referring to the team's fans. The Seahawks have three different jersey colors: navy blue, white, and an alternate grey jersey. The Seahawks will have three different pants: navy blue with green feathers, gray with navy blue feathers, and white with navy blue feathers. Their new logo replaces the Seahawk blue with wolf grey. Altogether, there are nine (9) different uniform combinations possible.
The Seahawks wore their Nike home blue jerseys for the first regular season game on September 16, 2012 against the Dallas Cowboys. The uniform Marshawn Lynch wore in that game is preserved at the Pro Football Hall of Fame. On September 9, 2012, the Seahawks wore their Nike white away jerseys for the first regular season game against the Arizona Cardinals; on October 14, 2012, with the Carolina Panthers wearing white at home, they wore their blue jerseys with gray pants (and would do so again against the Miami Dolphins seven weeks later); and on December 16, 2012, they wore their Alternate Wolf Grey jerseys for the first time against the Buffalo Bills.