Available from http://www.righthand.folksy.com/
Available from http://www.angelicfolk.folksy.com/
Available from http://www.groovygurlz.etsy.com/
Cool Britannia
Available from http://www.lillipopsdesigns.etsy.com/
Also from this designer
If you are feeling inspired to create a new wardrobe for your children there are some great patterns available in these books:
Making Children's Clothes by Emma Hardy
Little Stitches for Little Ones by Amy Butler
Weekend Sewing by Heather Ross
Also try Oliver + S patterns for some contemporary designs.