It is always best to let your body breathe naturally during this beautiful time. Avoid anything that squeezes your stomach too much. Stay comfortable and take care of yourself.
I just delivered a few months ago, and honestly, comfort is everything. Tight shapewear can feel suffocating and might put pressure on your bump. If you must wear it, choose a loose maternity-specific one and ask your gynac first.
Make sure it's not too tight because proper blood circulation is very important. I had to focus so much on my diet and walking routines for GD, and tight clothes would have made me so uncomfortable anyway. Check with your doctor once.
Honestly, don't waste money on expensive maternity shapewear. Regular loose cotton clothes are much better, and you can save that money for hospital delivery charges or baby shopping. Keep it simple!
I think it might be better to wear loose, comfortable clothes instead to be safe. Since you are expecting, keeping things gentle around your belly is a good idea.