That has to do with how the 93 Brand started. As you may know, it is one of the newer brands available despite its already strong reputation. When starting to make kimonos, they had to focus their investment on the sizes that were most likely to sell consistently - that means focusing on statistically average sizes. Now that they are building a user base they will have the opportunity to expand their size offerings both smaller and larger.

We don't have a timeline for expanded sizes, so in the meantime I would recommend this item to you: http://www.zengu.com/tf-gi-004.html.