die Uniform
uniform
Standardized clothing worn by members of a particular organization or group, such as soldiers, police officers, or students.
Der Polizist trug seine blaue Uniform.
The police officer wore his blue uniform.

uniform
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uniform
Standardized clothing worn by members of a particular organization or group, such as soldiers, police officers, or students.
Der Polizist trug seine blaue Uniform.
The police officer wore his blue uniform.

In connection with 'Uniform' (uniform), the verbs most often used are 'tragen' (to wear, describing the state) or 'anziehen' (to put on, describing the action).
Alle Soldaten müssen eine Uniform tragen.
All soldiers must wear a uniform.
The expression 'in Uniform sein' (to be in uniform) is very common. It describes that a person is currently wearing their service clothing.
Der Feuerwehrmann war auch in seiner Freizeit in Uniform.
The firefighter was in uniform even in his free time.
'Uniform' (uniform) is an international word from Latin. It is made up of 'unus' (one) and 'forma' (form, shape) and means 'one single form', which explains the idea of standardized clothing.
Die neue Uniform der Flugbegleiter sieht sehr modern aus.
The flight attendants' new uniform looks very modern.
costume / suit
'Uniform' and 'Kostüm' are both special types of clothing that can show a role or belonging. You wear a 'Uniform' as a member of an organization or group, for example in the police, the military, or sometimes at school. It is standardized and often official. A 'Kostüm' is worn more as a disguise or costume, for example at Carnival, at a party, or in theater and film. Learners may confuse the words because both can be clothing for a specific role. The practical difference is: a uniform shows a real function or membership, while a costume usually only represents a role.

Der Polizist trug bei der Kontrolle eine dunkle Uniform.
The police officer wore a dark uniform during the check.
Für die Theateraufführung hat er ein altes Kostüm aus dem Lager geholt.
For the theater performance, he got an old costume from storage.