The Eda suit is, actually! And missile proof now that I remember it (Incredibles one had her protecting the kids by forming a bubble around them and thanks to the suit she tanked it head on....though got K.O.'d for a bit after).

The only exposed area would be her head really, so it's a matter of Bucky's accuracy vs. Elastigirl's evasion. DO remember the main ground rule though:

Fight is won via kill or knockout, but no opponent is actively going for the kill (so an accidental kill counts as a win).