A few of us mums were just talking about this the other day, and we all agreed that comfort really is the top priority, especially in the third trimester when feet start swelling. Look for something with good arch support and soft, flexible soles so your feet are not aching by end of day. One of my mum friends swore by her Birkenstocks throughout her pregnancy because they were breathable and easy to slip on without bending down too much. Sandals with adjustable straps are great too since your feet size can change as the months go by lah.