Surgical bra. How tight or loose should it be? (Photo)

There is no “standard” when it comes to the use of specific bras or garments after breast surgery. In other words, different plastic surgeons may have different practices when it comes to postoperative dressings/bras. Therefore, best to communicate with your plastic surgeon's office for specific advice/thoughts.
In my practice, patients wake up with a surgical bra in place. This surgical bra, although not attractive, is supportive and used for about one month after surgery (some of my patients have been known to burn the bra ASAP). Then, patients transition to a soft sports bra. Wired bras are used when breast implants have reached their “final position” and patients have full sensation along the breast skin.  Having said that, generally best to avoid a bra that is too tight and can potentially "cut into" the patient's skin.  Like most things, getting the support of the bra just right is best.
 
  Best wishes.

Dear bwashington,I understand your concern. However, every surgeon has a specific technique or management on how to go about wearing post-operative bras, as this would depend on various factors including the type of surgery, the size of implant, and the technique used during the surgery among others. It is best that you discuss your concerns with your plastic surgeon and follow his or her advice on the best options available for you. Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Many thanks for a important question.
Normally plastic surgeons check the tightness of the bra before sending you home and therefore it should be fine if you can mange it.
I normally give a size which is comfortable to wear.A very tight bra is of no help to any one just like a very loose bra will be useless and will not do its job.
I think just go by your comfort.
Wish you all the best