If you are really worried about fit, buy shirred items. They give a lot of wiggle room and can help some items fit very nicely. I own the Cat & Window print OP size M in black and the shirring allows me to fit in it comfortably. It's a wonderful dress
Most of their items are not shiny, but as Meiki said, if it's shiny in the posted picture, then it's shiny in real life. And pay attention to length measurements if you are tall; I went to their store in Osaka and was shocked by how short a lot of the skirts were on me!