Breast Forms
(noun)
Prosthetics that some trans people, crossdressers, and drag performers use to alleviate dysphoria and adjust their presentation. Prosthetics like breast forms allow people to better fill out cisnormative clothing. They are usually made of silicone and can come in a variety of colors and sizes. Some are self-adhesive, some require adhesive such as double sided tape, and some require specific prosthetic undergarments designed to hold them in place.
e.g. Kitana used breast forms early on in her transition, before her chest filled out from estrogen, to make her clothes fit better.
Places to purchase breast forms: Amoena | The Breast Form Store

Breast Form by Amoena
They produce medical grade breast forms for those who have had medical mastectomies and trans folks alike.
Further reading to gain expanded context:
Gender Expression Gear | Scarleteen
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