Hi luckycple!
I have both of my nipples pierced and honestly, even with an unpadded bra the ball is hard to detect under my clothes. I have a hoop with the ball capture.
If I'm wearing a thin bra and a tight top, you can see the outline a bit...but for the most part I don't wear that sort of thing often and don't worry about it when I do.
I enjoy all of my piercings, but sometimes you do have to educate your partners a bit to your preferences (pulling, tugging, biting, licking, etc) as you may have greater sensitivity afterwards.
