Its haraam and not allowed.
Check out the fatwa of our ulemas In the book
''code of ethics for muslim men and women'',
under Section 1 ''Rules related To looking At others'',In the category (C) Women Looking at Non-Mahram Men
C) Women Looking at Non-Mahram Men
45 – Rule: It is haram for women to look at the bodies of non-Mahram men with the exception of the face, hands, and that amount which men normally do not cover. AGKMST
Therefore: It is not a problem for women to look at the hair on the head, the face, the hands up to the wrist, the feet up to the ankle, and the neck of a non-Mahram man with the condition that it is not associated with lust. Thus, women are not allowed to attend sporting tournaments [such as swimming, wrestling, weight lifting, soccer (also known as football in some countries) etc…] in which men do not have proper covering.
46 – Rule: It is haram to look at the arms, chest, or any other part of the body of a non-Mahram man who is wearing inappropriate clothing, such as a short sleeve shirt, or has kept the collar of his shirt open, or is wearing see-through clothing, etc… even if it is without the intention of lust. AGKLMS
P.S note that the initial S stands for the ruling of Ayatullah Sistani[may Almighty grant him a long and healthy life]
For those interested,below is the link for the online book:
http://www.al-islam.org/a-code-of-ethic ... and-women/
This book is also available for sale in our Tabligh bookshop in Dar.Its very enlightening and informative.