I say, and with God's success: The Ihram clothing is specific to men after entering the state of Ihram, not before. If you have entered Ihram, it is required that you do not wear anything else. If you wear something else for a day or a night, you are required to sacrifice a sheep in the sacred area. If it is less than that, you are required to give charity equivalent to half a sa' (a measure of volume). Thus, the deficiency in Umrah is compensated, and it is valid. And God knows best.