@Locksley ,@
Christabel03 etc - If you aren't able to invest in masectomy pocketed swimwear, i know they are rather expensive ,you can modify and add a pocket yourself if its the right shape and style of swimwear.Many swimwear has build in bras now a days and styles that have higher chest coverage is best and you can get a pocket design on Cancer council website. You can also wear foam forms in the water, just squeze them out with your arm when you get out to slow the drip. You can wear your good silicone in water , but make sure you wash and rinse it well , you can also wrap it in glad wrap for extra protection. But they are not designed for regular swimming and it will make them deteriorate faster, so better to use an old one or a foam or if swim regularly invest in a water option. They do also make a 'swim form' that has a more relaxed breast shape.There are also microbeaded breast forms that can go in the water.The light weight ones are more prone to wander up and around compared to one with more natural weighted ones and silicone that moulds to your body.
https://www.cancercouncil.com.au/wp-content/uploads/2014/05/2009-bra-pocket-pattern.pdf