What is the ruling on wearing an abaya with sleeves that is worn on the head?

If the abaya is concealing, loose-fitting, does not show what is underneath it, and is not an adornment in itself, then there is no harm in wearing it. Its having sleeves does not matter. The basic rule for clothing is permissibility unless there is evidence of prohibition, or if it leads to temptation or draws attention. Thus, embroidered abayas that draw attention are prohibited not for their intrinsic nature, but for the temptation they cause. Similarly, abayas that resemble men's clothing are prohibited. The old abaya that has no sleeves and covers the woman is better than this, but prohibition requires clear evidence.