Looking for a way to liven up spring wardrobes? Put a stripe on it. A simple sweater from Burberry, Dior or Loro Piana feels fresh with lines of bold color while the matching sets from Ulla Johnson and Max Mara make for double the impact. The trend can feel jaunty—see bright sweaters from Dior or Polo Ralph Lauren—or evoke a rainbow’s ephemeral beauty, as with Valentino’s silk kaftan. Layering on accessories can also capture the same effect. Colorful jewelry from Fry Powers and Jessica Bieles, an oversize striped Eric Javits straw hat or a classic Gucci bag with racing-stripe print offer easy options to fall in line....

Looking for a way to liven up spring wardrobes? Put a stripe on it. A simple sweater from Burberry, Dior or Loro Piana feels fresh with lines of bold color while the matching sets from Ulla Johnson and Max Mara make for double the impact. The trend can feel jaunty—see bright sweaters from Dior or Polo Ralph Lauren —or evoke a rainbow’s ephemeral beauty, as with Valentino’s silk kaftan. Layering on accessories can also capture the same effect. Colorful jewelry from Fry Powers and Jessica Bieles, an oversize striped Eric Javits straw hat or a classic Gucci bag with racing-stripe print offer easy options to fall in line. —Jenny Hartman

Red, yellow and blue are the building blocks of a cool look. From left: Chloé dress, $3,595, select Chloé boutiques, and Polo Ralph Lauren sweater, $298, ralphlauren.com; Polo Ralph Lauren dress, $198, ralphlauren.com.

Sweeten the day with lively hues. Valentino dress, $4,200, select Valentino boutiques, Jessica Biales earrings, $1,350, JessicaBiales.com.

Louis Vuitton vest and sweater, prices upon request, LouisVuitton.com; right hand, from top, David Webb ring, $9,500, DavidWebb.com, Repossi band, $3,900, and ring, price upon request, Saks.com; left hand, Jessica Biales striped bands, prices upon request, JessicaBiales.com and Fry Powers solid-color bands, prices upon request, FryPowers.com.

A jaunty ensemble sets sail with matching socks. Max Mara top, $450, and skirt, $565, MaxMara.com, Ben Sherman socks, $36, BenSherman.com, Roger Vivier shoes, $875, RogerVivier.com.

Dior blue sweater, $1,500, select Dior boutiques, and Eric Javits red hat, $425, EricJavits.com.

Resort to sunny-weather pieces that make a big impact. Akris dress, $2,990, Akris.com, Jessica Biales earrings, $1,350, JessicaBiales.com.

Be berry happy about everything. Loro Piana sweater, $1,950, and shirt, $1,710, us.LoroPiana.com, Gucci bag, $6,700, select Gucci boutiques, Jessica Biales earrings, $1,350, JessicaBiales.com.

Emporio Armani top, $675, and skirt, $825, Armani.com, Jessica Biales earrings, $1,350, JessicaBiales.com.

Take a step toward retro chic. Burberry sweater, price upon request, us.Burberry.com, Jessica Biales earrings, $1,350, JessicaBiales.com, Emilio Cavallini tights, $28, EmilioCavallini.com, Roger Vivier shoes, $775, RogerVivier.com. Model, Emily Kasten at The Industry Model Management and Claire VanBeber at Parts Models; hair, Hikaru Hirano; makeup, Kiki Gifford; manicure, Mamie Onishi.