It depends on the situation surrounding the birth. Until (if) I have a boy and girl I will find out. Certainly you can put girls in boys clothes and boys in girls or buy gender neutral, but frankly I dont want to.
This is a personal reason that probably wont change your decision, but DH will miss most of the pregnancy and birth. He will come home to a very different and difficult life. If I can provide him (and all my family living away from me) one more way to bond/make the pregnancy seem more real ahead of time then I will.