Masking with so called 'female rubber masks' is a rather unusual way of feminine disguise and is regarded as special form of 'cross-dressing'.
Female face masks made out of latex are the most prevalent in this regard, as they allow a relatively realistic transformation at rather low cost.The professional masks for changing face are mostly made from foamlatex, a material that is used in theater and movie productions as well; the resulting disguised appearance is realistic enough to fool some people if one doesn't look hard enough.There are some restrictions concerning those masks though: namely having some kind of allergic reactions to latex / natural rubber or suffering from claustrophobia. In those cases applying individual makeup or getting one of those prohibitive priced yet very realistic silicone masks might be a better choice. Some excellent masks can be obtained from here or here.
A few examples of what can be achieved with latex face masks can be seen in the following videos provided by Youtube:
