Now, on this blog I have mentioned three types of Lolita headdresses: round, oval, and rectangular. This was a mistake of mine; I somehow became under the impression that "oval" was its own category.
For clarification, here are examples of each headdress:
The difference between the last two may be difficult to see. The second one, from Victorian Maiden, has a distinctly round edge, whereas the third, from Baby, is more of a rectangle. The truth is, these are both rectangular headdresses; I somehow became confused a while back.
So, for those of you who were wondering what an oval headdress was, I hope this gives clarification.