For a stage 2 faja post BBL does it have to be one that includes the shorts?

Follow your plastic surgeon's advice.  Plastic surgeon preferences for compression garments and length of time to wear differ.  I typically ask patients to use adjustable garments with multiple bands so that tension can be adjusted and the areas of liposuction are less likely to get a fluid collection. The garments typically do not cover the buttocks.
Kenneth Hughes, MD, ABPS Board Certified Plastic Surgeon
Los Angeles, CA

Compression garment protocols vary from surgeon to surgeon. Post-operative compression garment therapy is very important in order to achieve the best results. However, if a garment does not fit correctly, unevenly distributes pressure, or  is too tight... it may affect and hinder ones overall result. It is always best to review and make sure your garment is adequate by reaching out to your surgeon in order to maximize your result.

Hello dear!!
Thanks for the question and provided information as well.
Every doctor has their preferences in regards to compression garments. I suggest my patients to use a full body compression garment (that closes with clips), 24/7 for the first 3 months, and after that, for 12 hours a day for 3 more months, to get the best results.
It is important for the compression garment to be very tight, for it to help with the swelling, after surgery, and to use it with a cotton t-shirt underneath to avoid garment burns.
Please, follow up close with your plastic surgeon.
Good luck :)