Is it haram to buy a Muslim child a costume for Halloween? I know that some Muslims do this already.

In the Name of Allah, the Most Gracious, the Most Merciful.

As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.

Kindly refer to the following Fatwa

And Allah Ta’āla Knows Best
 
Checked and Approved by,
Mufti Ebrahim Desai.