This is very warm and so comfortable to wear.  It is made from 80% cotton and 20% polyester and is slim fitted, has a YKK front opening zipper, 2 piece hood and kangaroo pouch pocket.
 
Note from Miss Rachel:  These onesies are lovely.  Mollie had her first one for 2 years and it is still going strong; now just a bit short in the leg! 
 
Which size to order? Mollie aged 5 has just got the purple onesie for 5-6 years and probably will fit for another 2 years.