Jordan is sun, stone, and walking. Petra is not a flat path. Wadi Rum is wind and dust. Amman is a city. One pretty outfit will not cover the week. Pack for the walking first.
A scarf that can do three jobs
I take a light scarf. It covers my hair if I go into a mosque. It keeps the dust off my face in the desert. It is an extra layer when the evening in the desert drops colder than the afternoon. It takes no space. I do not understand a Jordan packing list without one.
Shoes before clothes
You will walk on stone. Pretty sandals will ruin Petra for you. I want a closed shoe with grip, already worn in, and a second pair that can get dusty. Break them in at home. New shoes and a full day in Petra is a bad mix.
Shoulders and knees covered
At religious sites I cover my shoulders and my knees. A long linen shirt over trousers does that without looking like I packed a costume. Shorts are fine in some tourist spots. They are the wrong choice for the places that matter. Neutral colours also hide the dust better than white.
The sun is the real issue
Even outside summer, the sun on pale stone is strong. Hat, sunglasses, and a sunscreen you have already tested on your face. A lip balm with protection, not a tinted one that does nothing. I keep those in the day bag, not at the bottom of the suitcase.
A small bag for the monument
Big backpacks are awkward in doorways and on narrow stairs. A small crossbody bag holds water, the scarf, cash, and the camera. Water matters more than another lens.
What stays at the hotel
The nice dress, if you want one dinner. The extra shoes. Half the toiletries. Anything I cannot replace on the first day stays in my personal item, not in the bag I check. I keep a short list of 7 things I never check in my suitcase. Use the same rule here.