I am happy to admit that I don't know much about chemical weapons, but I cannot quite understand:
In all the videos from the aftermath that I have seen you can see emergency personnel washing the faces of the victims with hoses etc.
I would expect that a victim's clothing would absorb a lot of these chemicals when exposure occurs and I would want to shed such clothes ASAP so that I don't keep breathing the fumes, and yet that does not seem to be the case...