Egypt is like any place in the world, the Egyptian have them own traditions and traditional dress code. 
 
When visiting Egypt, lightweight, breathable clothing is ideal for the hot climate—especially in spring and summer. For cultural respect, it's recommended to dress modestly, especially at mosques and religious sites. Women should consider wearing loose-fitting clothes that cover the shoulders and knees, and carrying a scarf for certain visits. Men can wear t-shirts and long shorts or light trousers. Comfortable walking shoes are a must for exploring ancient sites like the Pyramids of Giza or Valley of the Kings. Pack layers for cooler desert evenings in winter and light jackets for Nile cruises. 
Tip: this is the best dress code or clothes in Egypt, in case it is not available no worries the Egyptian respect all the cultures and they understand this is how you wear at home so it is OK.