So scarlet it was maroon.

Taylor Swift may be a lifelong Philadelphia Eagles fan, but her closet is quickly filling up with red-and-black pieces in support of the Kansas City Chiefs.

Taylor Swift wore a custom Rails skirt in Chiefs colors to cheer on Travis Kelce at his game against the New England Patriots.

Rails custom-made the semi-pleated skirt for Swift, coincidentally (or not) in Chiefs colors.

On Sunday, the “Cruel Summer” singer supported boyfriend Travis Kelce, the team’s tight end, by attending his game against the New England Patriots in Foxborough, Mass. with dad Scott by her side.

While Swift shook off some booing from the “dads, Brads and Chads” in attendance, Kelce and his team walked away victorious — and Swifties enjoyed seeing the superstar decked out in Chiefs hues once again.

Along with her vintage Kansas City sweatshirt, signature scarlet lipstick, garnet ring and knit beanie stitched with Kelce’s jersey number, Swift wore a custom plaid pleated skirt from Rails that incorporated shades of red and black — coincidentally or not, a tribute to the team’s colors.

Swift hugged Mahomes as she cheered on the Chiefs.

.

Swift’s dad, Scott, joined her in a box at Gillette Stadium.

“It’s no secret that Taylor loves her plaid skirts and has been the ultimate muse for this season’s schoolgirl trend,” Rails Vice President of Women’s Design Linney Warren told People of the design.

“When we were imagining custom pieces to create for her, we wanted to give her things that she could seamlessly incorporate into her wardrobe — we were thrilled when she chose to style it back to a vintage sweatshirt for the Chiefs game for a bit of nostalgia!” Warren continued.

While Swift’s bespoke style is not currently shoppable, the brand’s Prim skirt ($188 $131) offers a similar pop of plaid — and is currently on sale for 30% off.

Swift and Kelce have been dating since the summer and went public with their romance in September

The couple celebrated in Kansas City last week before Swift hosted an A-list birthday party in NYC with friends

The singer, 34 has been quite literally wearing her heart on her sleeve since going public with Kelce, from rocking vintage Chiefs merch to sporting friendship bracelets adorned with the NFL star’s nickname and jersey number.

And last week, while Swift was celebrating her 34th birthday with pals, she flaunted a massive new opal ring encircled by a halo of blue jewels, which may have been a gift from Kelce, 34, as it seems to feature both of their birthstones.

Page Six Style is informed by experts that the pear-shaped sparkler may be worth up to $175,000.

We have a feeling there will be merchandise of all types under the Christmas tree, as well as plenty of mistletoe to go around, since sources exclusively tell Page Six that the couple plans to spend both Christmas and New Year’s Eve together.