Athleta Girl brings the same premium Powervita and performance fabrics from the adult line into kids' sizing, with longer inseam options that parents of tall girls swear by. Durable enough to outlast growth spurts and soft enough for all-day wear.
Everyone has a pair of go-to leggings, and these have been mine for years. I'm obsessed with the Powervita fabric from Athleta, which feels super soft and buttery, yet supportive.
Athleta, although those are expensive and you might be happier getting them second hand for a growing kid.
Madewell, Lululemon and Athleta all have tall lengths. It's not a lot more - my 5'11" daughter is just barely covered - but it's a good place to start.
Carter's is the go-to brand for children's leggings, consistently recommended by parents for soft cotton fabric, reliable sizing, and affordable multi-packs. The pull-on elastic waist makes dressing easy, and the durable construction holds up through repeated washing.
Hanna Andersson's budget-friendly Moon and Back line delivers GOTS-certified organic cotton leggings in convenient 3-packs. Soft, breathable, and free of harsh chemicals, ideal for babies and toddlers with sensitive skin.
Simple Joys by Carter's delivers four pairs of leggings for around $18, one of the best per-unit values in children's basics. Parents love the mix-and-match colors and the reliable Carter's fit that works for most body types.
Old Navy's PowerSoft fabric is a community favorite for active kids and teens, buttery soft, lightly compressive, and available in tall/long lengths that are nearly impossible to find elsewhere. Parents on Reddit consistently recommend it for growing kids who need coverage and comfort.