IPA: /ʌnˈkɔːsɪtɪd/
KK: /ʌnˈkɔrsɪtɪd/
Not wearing a tight-fitting garment that restricts the waist, allowing for more freedom of movement and comfort.
She felt more comfortable and confident in her uncorseted dress at the party.
Uncorseted → It is formed from "un-" (meaning not) and "corset" (from Old French *corset*, meaning a fitted undergarment). The word "uncorseted" means not wearing a corset or free from the constraints of a corset.
Think of being 'not' ('un-') in a 'fitted undergarment' ('corset') — that's why uncorseted means free from wearing a corset.