If you're looking for something that contrasts with the presence of epaulettes:
* Plainness: This could refer to a uniform or garment that lacks any adornments, including epaulettes.
* Simplicity: Similar to plainness, this implies a lack of ornamentation.
* Unstructured: Describing a garment without defined shapes or additions like epaulettes.
If you're looking for something that contrasts with the function of epaulettes:
* Unmarked: This refers to a garment without any distinguishing features, including epaulettes used for rank or identification.
* Unidentified: This could indicate a lack of any indication of status or role, which epaulettes sometimes signify.
If you're looking for a word with the opposite meaning of epaulettes, you may need to provide more context.
For example, if you're talking about a garment that is *not* decorated with epaulettes, then you could simply say "without epaulettes".
Remember, the best antonym will depend on the specific situation and what you're trying to communicate.