Aww.. mamabird .. how cute that your children are already interested in fabrics. That's how my oldest daughter got started. She used to sit and watch me sew. Then I bought her a "fashion designer" kit when she was 7 or 8, where the child used plastic templates and designed different clothing on paper.
She is now a manager for Hanes, Inc. ... so your little ones may have a bright future.
And it IS always a fun trip to buy F A B R I C .... kids and all!! Let us know what you are making. :D