Flame retardants are kind of like BPA, in everything. The one place I don't want them is next to my children's skin. That's why I have fazed out flame resistant PJ's and I think you should too!
It's super easy! For my little ones I started buying the Organic snug fitting Pj's at Costco but what to do about my big girl who is wearing size 12? leggings and t-shirts have been working great or if you are handy at sewing make your own!
Here are some great links about the the hazards of flame resistant sleepwear so you won't have to just take my word for it.
Sleeping with the enemy
The Soft Landing
Flame Retardants found in breast milk