Wearing a military uniform that one is not authorized to wear can have serious consequences, even if it is just as part of a costume or for cosplay. The consequences can vary depending on the country and the specific circumstances, but here are some potential outcomes:

1. Legal Consequences: In many countries, it is illegal to wear a military uniform that one is not authorized to wear. Depending on the severity of the offense, penalties can range from fines to imprisonment.
2. Offense to Military Personnel: Wearing a military uniform without authorization can be seen as disrespectful to those who have earned the right to wear it through service to their country. It can also be seen as an attempt to impersonate a member of the military, which is not only disrespectful but also illegal.
3. Risks to Safety and Security: In situations where someone is wearing a military uniform without authorization, they may be mistaken for a member of the military or law enforcement, which can create confusion and potentially dangerous situations. This is especially true in situations where security is heightened, such as airports or other public events.
4. Ethical Concerns: Some people may find it offensive or disrespectful to wear a military uniform as part of a costume or cosplay, as it can be seen as trivializing or glamorizing the sacrifices and hardships that military personnel endure.

In summary, wearing a military uniform without authorization can have legal, social, and ethical consequences. It is important to respect the significance and meaning behind military uniforms and to only wear them if one has earned the right to do so.