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I would recommend contacting https://www.traceyg.com/
Ther are also patterns to sew your own pocket into a bra. They used to sell them precut too, not sure it they are still around. You can also buy a fabric cover for a prosthesis for comfort in a non pocketed bra. But a well fitted full cup style is usually needed to keep it in. There are many types of prosthesis as well.
Tracey G-Prosthetics & Lingerie , they can help on phone, or zoom ( especially if your not near their brisbane or maroochydore store) and help find solutions and suggest pocketed bras they cut different ways once you tell her wehre the pacemarker is located. If it is like a port a cath that sticks up, i would also suggest some soft foam , may be an x back bra might put straps further out., bra strap non slip shoulder grips maybe not strongh enough, BOOB clip for the back.
There are a couple others who also do online zoom consults, Erilan does,www.erilan.com.au
You can also go to the Amoena website and search for distibuters, they are far and wide and not all are equally good, so worth a drive if you can get to a good one. ( department store ones seem to not be as good as the rare specialty stores)
If your near Woollongong i can recommend CasaMia Lingerie for masectomy bra options and an in person fitter , make appointment.
Ther are also patterns to sew your own pocket into a bra. They used to sell them precut too, not sure it they are still around. You can also buy a fabric cover for a prosthesis for comfort in a non pocketed bra. But a well fitted full cup style is usually needed to keep it in. There are many types of prosthesis as well.