A little bit of denim can be a good thing — a cute pair of jeans, or a simple chambray button-up, for example. But too much of the blue material can cause a fashion faux pas — just ask Lena Dunham and Andy Cohen. The girls of San Diego Comic-Con, meanwhile, brought their A-game in a variety of colors and silhouettes.

Alicia Vikander

After securing her place as 2015’s It girl with her turn in “Ex Machina,” the actress, who has six more films in the works this year, continues her triumphant fashion reign in a white Rosetta Getty crop top and matching pants at the Entertainment Weekly celebration at Float at Hard Rock Hotel San Diego.

Emma Roberts

“Scream Queen” starlet Roberts heats things up at the Comic-Con Fox Fanfare Party with a negligee-inspired AWAVEAWAKE silk dress that paired perfectly with her pale complexion.

Natalie Dormer

The paisley-patterned Mary Katrantzou frock is royally fitting for the “Game of Thrones” star at the Screen Gems panel during Comic-Con — and her ponytail adds a cute touch.

Ashley Madekwe

The “Salem” actress is a tour de force at Comic-Con, debuting a number of fashionable ensembles. The best of the bunch? This checkered Self-Portrait pants-and-crop-top combo at the 20th Century Fox party at the Andaz Hotel.

Lena Dunham

No, that’s not a potato sack. Lena Dunham doesn’t do herself any favors in this shapeless Alexa Chung for AG Jeans denim dress.

Andy Cohen

Is that Justin Timberlake circa 2001? Nope, just Andy Cohen at the world premiere of “Trainwreck” — which, coincidentally, is the only word used to describe this denim suit.

Dascha Polanco

A pop of color is good — all of the color is bad. The “Orange Is the New Black” actress looks like a box of Crayola crayons in this multicolor mess.

Julia Mancuso

Being a professional athlete is no excuse for poor taste. Alpine ski racer Julia Mancuso covers her “Body Issue”-worthy frame in a tacky mesh frock adorned with neon yellow flowers at the ESPYs.