I purchased this for an upcoming trip to Africa.  I cannot comment on the bug repellant capabilities since I have not used it yet.  But, I wanted to review the fit and quality.  I wear a 4 pant.  I am 5'5", 118 lbs.  I bought a medium which fits perfect.  It seems to be very high quality.  There is a strong chemical smell.  I plan to wear a very thin t-shirt underneath to protect my skin from the chemicals if weather permits. I am a mosquito magnet though, and I don't want to come back with Malaria!