So how does the nudity begin??

Like this!

Ginny stood to leave the library, blissfully unaware that the unravelling had slowly begun on her shirt and trousers, of what would eventually peel away and expose her pink lacy underwear that she had chosen that day, the bra being transparent enough to show her nipples (a personal choice to impress harry) What Ginny didn’t know was that the curse carried a 2nd layer, in that intimate clothing like bras and panties would snap upon the click of Hermione’s fingers and begin a slow teasing decent, enough to turn on the host.

As Ginny left by the door, the door snagged on the threads which were unrevealing the clothing, thereby accelerating the undressing process, all the while, hear head was engrossed in the book and was unaware that soon, she would be naked.

The corridor was quite filled with students, waiting for their next lessons, from all 4 houses of Hogwarts, the door’s efforts causing her collar to very quickly disappear and the cleavage of her well developed breasts to start to appear. Meanwhile, her legs slowly started to become apparent as the cuffs of her trousers became ragged - Hermione also quickly flicked her wand which caused her socks and shoes to suddenly vanish, leaving Ginny barefoot.