The long skirts had to be shortened. They were very happy, and thankful. Know your customer and be able to adapt. An inexpensive trick is to use a balloon with a string attached to the hanger. Always have extra outfits when ever you use a certain outfit as display.
Some customers shop by display.
If it is on the model, that s the dress they have to try on. You do not want to keep you customer waiting while you undress a mannequin. Most maternity apparel have little hanger appeal. Using back clips when ever possible, give that slim appeal. Suggest to your customers dresses that look better on than on the hanger.