Maternity photos- what to wear??

Addi • Baby #2 due Jan 22!
Hi ladies, I need help! We have maternity photos scheduled for next Sunday and I have no idea what to wear :/ I've got a maxi dress that is maroon with big blocks of gray stripes, or a knee length black dress. We are planning on something at the beach and/or forest nearby, but it might be rainy/overcast. Any suggestions on what colors might look good at the beach with cloudy weather? Would anyone recommend the good 'ol jeans and t-shirt look? Thank you!