Hi there! Yes you are correct that the Princess print is at the Dooney outlet. I have first hand experience as I purchased the Princess Bucket bag at the I-Drive Premium outlet on Dec 16!!
Even better, the Dooney outlet had a 50% off sale that day, as they sometimes do on weekends. If you do visit the outlets, try for a weekend as I find the sales are usually on then.
I wanted to mention that I find that the I-Drive Dooney outlet has a better selection than the Vineland Dooney outlet in my experience.
On Dec 16, the I-Drive outlet had the White Princess Bucket bag, the Black Princess Domed Satchel, the Brown Mickey Silhouette Champsac, and 1 or 2 other designs/lines - sorry I forget! Maybe Mickey colourful silhouette or original white Cindy Sketch? (Please correct me if you know).
At the Vineland outlet, a couple days before, they only had 1 Disney bag - the Black Princess Domed Satchel.
Hope that someone else is able to find a bag at the outlets that they can't find in the parks and has good luck like myself!