Stretchy with side zip. Double wrap sash and with netting in the collar to keep its shape. 
 
The Habits Travel Collection is made and imported from South Africa. It is made of high quality jersey and once steamed does not crease so a great travelling wardrobe. There are lots of individual pieces that you can build up gradually to complete your wardrobe. I order regularly and they can take from 4 to 6 weeks.