I had the same problem too when I was pregnant, especially for office wear. Nowadays there are a few websites selling Korean style maternity wear but I find that the designs are not suited for the office environment. Can't expect people to take you seriously when you come to work dressed like a K-Pop star wannabe in a bump, can you? I do not really like wearing larger sized clothes during later stages of pregnancy because I find that the form is compromised. Doesn't flatter my shape either

Now that I'm nursing my baby, same problem but with breastfeeding clothes. Most you find at the mall are ordinary looking but expensive. I did order a couple from those websites selling Korean design maternity/ nursing wear for casual use but was thoroughly disappointed with the quality for the price I paid. I like to wear dresses but am limited by nursing. Ah well, the search is still on