Is it a good decision to buy gender neutral clothes before the baby arrives?

Ya, it is absolutely fine. When I was eight months pregnant, I too shopped for the baby. Though, I got lot of gifts on my baby shower, I still could not hold myself back for buying more. If you are not too keen on buying more things at least buy the basic things that you would require after the baby is born. Also, after delivery you will not have much strength to run around and do shopping, so it is wise to buy things for the baby in advance.