Shopping for maternity jackets

I’m heading to Frankfurt for a work trip in mid-February and it completely slipped my mind when I was busy ordering maternity clothes before Christmas. Now I’m looking at these thin jackets on ASOS, Old Navy and Gap websites but not finding anything that seems thick enough.

Any suggestions on where I can find warm maternity jackets that don’t make me look like a penguin? Preferably an online site that delivers FOC to Singapore or the U.S.