For now, there is a list here:
https://lotro-wiki.com/index.php/LOTRO_Store_Cosmetics
I do not think (or know whether) it is complete, but each item does contain some pictures to give you an idea as to what it looks like.
The preview option is important though as you can change colors and such to see how it dyes, which a screenshot of course does not tell you.....
Moved from Riddermark to Arkenstone on 9/29/2015!
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Disclaimer: The definition of "Soon™" and "In The Near Future™" is based solely on SSG's interpretation of the words, and all similarities with dictionary definitions of the word "Soon™", "Near", and "Future" are purely coincidental and should not be interpreted as a time frame that will come to pass within a reasonable amount of time.