Having never worn the Jason Wu ones I can't make a direct comparison but I'd say these new ones are 'okay'. The top is quite thin and on me a bit tight across the chest; would have been nice to have a button at the neck or a v-neck. The pants have a decent amount of space and are comfortable. The material is somewhere between a regular t-shirt and a sweatshirt. I'm usually in between a US small and medium, and a large in the PJs fits me just fine. I do like that the amenity kit comes with a nice reusable tote bag.