Bekleidung vs. Kleidung
What is the difference in meaning of the words die Bekleidung and die Kleidung?
that's correct. "Bekleidung" is an outfit/uniform. "Kleidung" is just clothing/clothes.
They are almost synonyms. I translate you here what some german dictionary says, I think it helps: "Kleidung" everything (hat, shoes, skirts...) that one wears on his body to cover it. // "Bekleidung" set of clothes that one wears for a given purpose or season. // For example, you note the difference when you want to specify "summer clothes = SommerBEkleidung", you would not say "Sommerkleidung"