Thank you for mentioning it. I tried to replicate it and it seems it's caused by you wearing the clothing item in question, then deleting it. It was never removed from your avatar, so when you exited Outfit, you were still technically wearing it, but the image related to that clothing item was successfully deleted. The game then tried to load the image, but obviously couldn't find it.
I'll try and patch it :)
Then what most likely happened is that you simply did not save your progress when you deleted the item after exiting Outfit. It's easy to replicate.
Unfortunately I do not yet have a patch for it, as my programmer is unavailable at this moment. Luckily it's a very specific bug that people don't easily come across upon :)