Hi there and thank you for your question. Compression garments are very often recommend following a tummy tuck to help reduce swelling, prevent fluid accumulations, maintain the contour that was surgically achieved, and for patient comfort. Garments with the open crotch are not necessary, but they are often preferred by patients as it makes using the bathroom much easier in the immediate post operative period. Some offices will sell or provide specific compression garments to their patients, but Spanx options tend to be very commonly used as they are easy to find at local stores and most of the time patients are already used to wearing these beforehand. It is always wise to discuss appropriate garment use with your Board Certified Plastic Surgeon directly. If you are concerned about whether or not your garment is sufficient, you can always bring it in to your surgeons office to ask the staff. I hope that this helps and I wish you all of the best!