What color do you think we should wear for a last professionally done picture without our soon to be baby boy

White isn't always becoming. I'd go with a pastel top and dark pants. Lighter pants might make a person look bigger, although maybe this isn't a problem.

..........I would go with a white honestly and if you find the right shirt white....etc you can find a cardigon light blue and put it over,
pants i would just wear the pants you have or honestly a dark colored jean.....

white and blue should be a great theme

i'd say - white for a boy, might be w/ light blue color accent (i'd think of my son as of angel being sent to us by God from heaven). i'd wear white&black blouse w/ the milking cow pattern (actually, i have such), and black skirt. my dh likes blue, could be navy blue suit, as of more "mature" blue, maybe w/ green color accent, since he's worked so hard. a green tie w/ the $ symbols would be great i think. i might have it done this way some day. haven't thought about yet.