DeputyHeadMistress,
Children's jammies absolutely have to be flame retardant, the CPSC regulates fabric flammability and has since the 1950s ... the CPSIA re-asserts this law AND requires a General COmpliance Certificate stating that the item meets the Fabric Flammability Act, and, if necessary, "reasonable" test results must accompany the articles, these tests can be done on the components, unlike the brand new CPSIA regs, The testing is dependent on the fabric type, specific types of fabric are exempt....
but, and this is the big, awful news, adult clothing needs these GCCs too; if your clothing is made from the exempt fabrics (which are most natural fibers and a lot of nylons etc) you still are required to produce a GCC but the testing isn't necessary.
here is a link to the Act
http://www.cpsc.gov/businfo/ffa.pdfWe just learned about the adult clothing stuff last week, it nearly blow me away!