Advice from winter Momma's

I need advice from women who were pregnant during the winter!! I ran into a problem a couple days ago. Before I left for work I go to put on a fall jacket because it's been cold and as soon as I go to zip it up I go, "😳 crap." I barely made it over my belly 😂. Obviously I'm going to get bigger. So what did you guys do to keep warm?? Did you just buy a big winter coat so you could zip it up during the winter or what?? I'm not to keen on buying a giant winter coat to then no longer needing it in 3 months but will if I have too. Help!! Lol. I'm due in December!