The prophet (sallallaahu alayhi wa sallam) said:

“The women is object of concealment, when she leaves the house, Shaytaan (the Devil) beautifies her.”

[On the authority of Abu Ahwas from Abdullaah, recorded in Tirmidhi 1173, Ibn Khuzaymah 1685-1687, Tabaraani 10/132, Abdur-Razaak 5116, authenticated sahih by Shaykh Al-Albaani in Sunan of At-Tirmidhi 1173]