City Threads (Los Angeles, CA): boys and girls underwear, basic tops and bottoms, swimwear, and sleepwear in sizes for newborn to age 16, made from cotton and organic cotton fabric knit and sewn in USA. What a wonderful find!
Chasing Fireflies (Borden, IN): kids' apparel, dress-up, and accessories (many items imported, so use keywords "made in USA")
Columbiaknit, Inc.(Portland, OR): rugby shirts, cobble cloth, mock turtles and more for the entire family--like LLBean and Landsend, but made in USA!
Earth Creations (Bessemer, AL): short and long-sleeved tees of cotton and organic cotton, dyed with natural clays in beautiful muted colors of the earth, with eco designs
Ky's Hawaiian Shirts (Honolulu, HI): boy's and girl's Hawaiian shirts, plus cabana sets and dresses, made from cotton and rayon. (Silk shirts imported.)
Modest Apparel USA (Buffalo, MO): girls tops, skirts and jumpers, from a family owned, home-based business
Pineapple Clothing (Miami, FL): from yoga/activewear to "Mommy and me" matching outfits to special occasion dresses, this company creates custom fabric designs and prints, cuts and sews its garments in USA. [Affiliate: I earn commission on purchases through this link]
Royal Apparel (Hauppauge, NY): cotton and organic cotton kids' hoodies, sweatpants and tees. [Affiliate: I earn commission on purchases through this link]
Winter Water Factory (Brooklyn, NY): really cute baby and kids clothing made in USA from certified organic cotton fabrics.
Nordstrom: retailer of fine clothing, including many American-made products (keyword "USA")
Wooden Soldier (North Conway, NH): retailer of beautiful special occasion clothing for kids (up to size 16), including dozens of USA-made velvet and satin dresses. Great selection of children's dress shoes from Italy.
Softstar Shoes (Philomath, OR): soft-sole leather moccasins, sandals and boots in youth and adult sizes, plus adorable baby and kids soft-sole shoes. Many styles can be customized with a choice of colors. [Affiliate: I earn commission on purchases through this link]
Solmate Socks (South Strafford, VT): multi-colored knit socks, mismatched for more fun! Kids socks sold as "a pair, and a spare"
The Mouse Works (Earlysville, VA): whimsical hats and beenies, made from fleece scraps that would otherwise have ended up in the landfill
Wheel House Designs : fun socks in loads of great patterns, including holiday, designed in VT and knit in NC