Well, whether it is okay to wear an army jacket depends on several factors, including the context and intent behind wearing the jacket.

Here are some points to consider:

Authenticity: Wearing an army jacket as a fashion statement or as part of a costume without any connection to military service or respect for those who have served can be seen as appropriative and disrespectful.
Legalities: In some countries, wearing military uniforms or insignia as civilians may be against the law or regulated by specific regulations. It's important to be aware of the laws and regulations in your area before wearing an army jacket or any military-related apparel.
Symbolism: Military uniforms and insignia carry symbolic meaning, and wearing an army jacket may be interpreted as showing support or solidarity with the military or making a political statement. It's important to consider the potential impact and interpretation of wearing such clothing.
Sensitivity: Some people may have personal or emotional connections to the military, and wearing an army jacket may be seen as insensitive or offensive. It's important to be mindful of others' feelings and experiences.
Context: Wearing an army jacket may be more acceptable in certain contexts, such as in a historical reenactment, a military-themed event, or as part of a legitimate military uniform when authorized to do so.

Ultimately, whether it is okay to wear an army jacket depends on the context, intent, and sensitivity toward others. It's important to be respectful and considerate of the significance and symbolism associated with military apparel and to be aware of any legal regulations or cultural norms in your area. If you have any doubts or concerns, it's best to err on the side of caution and avoid wearing military-related clothing without appropriate knowledge and understanding. To get some tips you can visit: https://www.oasisjackets.com/army-jackets/
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In other countries, yes. They see it as military camouflage.
In Nigeria, no; unless you're prepared to do 450 bags of press-ups with 46 dericas of beatings.