Is 9,000cc an extreme amount of fat to be removed in an outpatient procedure?

I would not feel comfortable with that volume of removal and especially as an outpatient.  I would immediately see your plastic surgeon about your garment.  This can cause serious damage.

The Florida Board of Medicine set guidelines on liposuction to provide a measure of safety for the public several years ago.  They indicate that the maximum that should be taken in any outpatient liposuction setting be no more than 4000 cc.  The reason for this is that there can be a large fluid shifts when fat is removed.  The fluid moves from your intravascular circulation to the space where the fat used to be.  This can result in severe drops in blood pressure leading to potential life threatening complications.  If you are concerned, you need to contact your physician immediately.  If you are unable to reach your physician, then I advise that you go to your nearest ER to be evaluated.   Garments are made to be tight, but if it is cutting off circulation another potential consequence is tissue ischemia (lack of oxygen.)  Again, best to be safe and contact you physican.  Although the Florida Guidlines indicate 4000 cc being the maximum cutoff, not all physicians agree on this number.