If you're talking about clothing:
* Right side out: This is the most common antonym, meaning the garment is worn with the intended side facing outward.
* Outside in: This is less common, but it means the same thing as "right side out."
If you're talking about a process or situation:
* Outside in: This can also be used to describe something that is approached from the outside rather than the inside.
* Reversed: This implies a complete reversal of the original order or arrangement.
* Upside down: This suggests a complete change in orientation or perspective.
Example:
* Clothing: My shirt is inside out, but I'll turn it right side out before I leave.
* Process: We decided to approach the problem inside out, but it would have been more efficient to work outside in.
To choose the best antonym, consider the specific context and the intended meaning.