stripping at bedtime!

i had a lovely surprise at 9pm last night - emilie sat in bed reading a book- butt naked!
she had taken off her footless babygrow, wrap & nappy, then kept doing it
she can even do it with zip up baby grows, does anyone elses do this & how can i stop her or know of toddler proof jim jams?

Only thing i can think of are one's that fasten at the back?

oh yeah, didnt think of that
anyone know who makes them?

We have one, i'll see if i can hunt it out to find the maker. Got it from tj huges

thanks!