Who is rocking their Sunday best as a star-studded Week 4 takes shape?

The fourth Sunday of the 2021 season has nine early-afternoon matchups to ignite an exciting NFL slate.

Who is looking and feeling their best ahead of taking the field today? Four of the NFL's remaining undefeated teams will be in action, including the Arizona Cardinals (3-0) visiting the Los Angeles Rams (3-0) in a game of NFC West elites once the late-afternoon window opens up.

The Denver Broncos (3-0) will host the Baltimore Ravens (2-1), who visit the Mile High City with 42 straight 100-yard rushing games, one shy of matching the 1974-77 Steelers for the longest such streak in NFL history.

In today's early action, the surprising Carolina Panthers (3-0) will take on Dak Prescott's Dallas Cowboys (2-1), seeking just the third 4-0 start in franchise history while boasting the NFL's best defense.

Of course, later tonight, Tom Brady will lead the defending champion Tampa Bay Buccaneers into Foxborough against the New England Patriots, with whom he won six Super Bowls over a 20-year stint. The seven-time champ needs 68 yards to break Drew Brees' NFL record for career passing yards (80,358).

With no shortage of storylines to cover, let's see which teams donned their best pregame looks ahead of the action.

Arizona Cardinals

RB Chase Edmonds, WR Christian Kirk, DB Byron Murphy, LB Isaiah Simmons, QB Kyler Murray

Arizona is seeking only its second 4-0 start over the last 40 seasons (start 4-0 before finishing 5-11 in 2012). The Cardinals' 103 through Week 3 tied the Buccaneers for the NFL lead.

Edmonds and Kirk, who lead the Cardinals in rushing and receiving yards respectively, have played key roles in aiding the team's hot start.

The biggest key to Arizona early success? Teammates hyping up one another on the pre-game runway, of course.

San Francisco 49ers

WR Deebo Samuel

Samuel has grown quite comfortable drawing attention with his pre-game attire thus far in the young season.

In an ode to his first name, Samuel pulled up dressed in the attire of 'Deebo' (played by the late Tommy Lister Jr.) from the 1995 movie Friday.

Baltimore Ravens

WR Marquise Brown, QB Lamar Jackson

Baltimore visits Denver seeking the Ravens' first win in the Mile High City since the 2012 Division Playoffs. Despite keeping their respective threads laid-back, both Brown and Jackson, who leads the team with 251 rushing yards, appeared focused on business as usual ahead of taking the field.

Jackson is the first player in NFL history with 200 passing yards and 50 rushing yards in the first 3 games of a season.

Such an outing against Denver Sunday would tie him with Michael Vick (2011) for the longest overall such streak in NFL history.

Los Angeles Rams

CB Jalen Ramsey, WR DeSean Jackson, WR Robert Woods, NT Sebastian Joseph-Day

Los Angeles hosts division rival Arizona seeking only the Rams' 2nd 4-0 start over the last 20 seasons. The Rams started 4-0 in 2018 before losing to the Patriots in Super Bowl LIII. A victory today would also mark Los Angeles' 9th straight against Arizona.

This will be only the fourth matchup since 2000 between division rivals entering with a record of 3-0 or better.

So how does one prepare for such a huge game? Ask Jalen Ramsey, who visited the defending World Series champion Dodgers before turning his attention to Week 4.

Jackson and Woods pulled up to SoFi Stadium in some casual threads, but Joseph-Day showed up in his Sunday best and even paused for an abbreviated photoshoot.

Kansas City Chiefs

QB Patrick Mahomes, DT Chris Jones, DB Jay Snead, WR Tyreek Hill, RB Clyde Edwards-Helaire

The 2018 MVP leads Kansas City into an East Coast bout against the Philadelphia Eagles (1-2). For the first time in 57 games with Mahomes starting at quarterback, the Chiefs have lost consecutive games (including playoffs).

The defending AFC champions are actually under .500 for the first time since Week 11 of the 2015 season, when Mahomes was a sophomore with Texas Tech.

He enters his 50th career regular-season game with the most touchdown passes (120) and passing yards (14,832) by any player in that span.

Mahomes looks quite ready to bounce back judging by these Sunday threads.

His teammates Jones and Snead clearly got the team memo for rocking their Sunday best.

Hill, who has 70 total receiving yards during Kansas City's two-game skid, paid homage to Philly legend and Naismith Basketball Hall of Famer Allen Iverson with this nod to The Answer's famous No. 3 jersey.

Iverson's number was retired by the Philadelphia 76ers in 2014.

Helaire recorded his first 100-yard rushing game of 2021 and caught a touchdown pass in Week 3. Despite the Chiefs taking the loss, the second-year running back visits Philadelphia in high spirits with an impressively creative hoodie to match.

Philadelphia Eagles

DT Fletcher Cox

The six-time Pro Bowler is still seeking his first sack of the 2021 season but isn't lacking confidence ahead of chasing Mahomes around this afternoon.

Then again, the only way to pull off leopard print is to display the utmost confidence.

Indianapolis Colts

RB Jonathan Taylor

The Colts' 0-3 start is the team's worst since beginning the 2011 season 0-13.

Taylor is still seeking his first 100-yard rushing game of the season, but the second-year running back is clearly embracing the South Florida weather ahead of facing Miami's 26th-ranked rushing defense.

Washington Football Team

DE Chase Young

Washington (1-2) heads south having lost six straight against the Atlanta Falcons (1-2) dating back to 2006. Young, who is still seeking his first sack of the season, rocked all-black attire upon entering Mercedes Benz Stadium.

When asked Thursday about returning to peak form, the reigning Defensive Rookie of the Year simply said, "I'm real close."

Buffalo Bills

QB Josh Allen, WR Emmanuel Sanders, TE Dawson Knox, DT Ed Oliver

Buffalo enters Week 4 seeking three straight wins after losing a season opener, which the Bills haven't done since 1999 (4-1).

The Bills' Sunday threads appeared to lean more casual ahead of hosting the Houston Texans (1-2), who enter this matchup as a -16.5 point underdog.

Houston has not been this big of an underdog since 2005. Allen, who rocked a hoodie from his old high school, enters this matchup having tossed a touchdown pass in 14 straight games (including playoffs).

If he throws one today, he'll tie Ryan Fitzpatrick (15 from 2009-10) for the second-longest such streak in franchise history. Jim Kelly's mark (18 from 1986-87) is within reach.

Chicago Bears

Chicago Sky center Candace Parker

After 13 seasons with the Los Angeles Sparks, Parker took her talents east to play for her hometown squad. She pulled out a customized Bears (1-2) jersey ahead of the Sky hosting the Connecticut Sun in the semifinals of the WNBA playoffs. The Bears host the division rival Detroit Lions this afternoon.

Chicago has readily embraced Parker's return to the Windy City. Last month, Mayor Lori Lightfoot proclaimed September 16 to be 'Candace Parker Day.'

A win for both the Bears and Sky today could certainly help the good times continue rolling.

ESPN Stats & Information contributed to this story.