In addition to nature-themed transmog armor from the 10.2 Emerald Dream content, the PTR has a motley assortment of transmog ensembles including sarongs, Dreadlord armor, and wristwatches. Here is a look at the transmog additions that don't quite fit into the theme of the patch.
We don't know how these will be acquired in the patch, but some could point to the Trading Post, holidays, promotions, or special quests. As the Sarong is available in many colors, similar to the Vagabond helm/cloak sets sold each month, this could likely end up in the Trading Post rotation.