This is the 2151st most frequent Dutch word.
kleden
To dress or cover.
Here, 'kleed' is used in the reflexive verb 'zich kleden', meaning 'to dress oneself'.
Ik kleed me netjes voor het feest.
I dress up neatly for the party.
In this context, 'aangekleed' is the past participle of 'aankleden', meaning 'to dress/decorate'.
Ze hebben de kamer gezellig aangekleed.
They have decorated the room cozily.
In this case, 'gekleed' is used as the past participle of 'zich kleden' in a reflexive form, signifying 'to have dressed oneself'.