Understanding Awrah: Are Upper Arms Of Women Included In Her Awrah?
Yes, it is compulsory to cover the portion of upper arms including armpits. It falls in the application of وَ یَحْفَظْنَ فُرُوْجَھُنَّ ( covering of private parts and covering of parts annexed right next to private parts to ensure proper and complete covering of privates ). Please once again refer to the following video from 15:50 to 26:48 ( specifically from 15:50 to 19:38 ) https://youtu.be/vJx8K0c7irE?t=950