I am in a wedding next weekend and I will be almost 31 weeks.

The dress shows any little bump/panty line even on people who are not pregnant. Just curious what you ladies would wear underneath. I was thinking maybe maternity tights (it is cold here already- highs in 50's, lows in 30's) Has anyone tried shape wear? What kind of underwear? I have not even attempted a thong in months, lol.