Since she was a child? Nono, this is what is says:
"Imoen does not know when or how she acquired this belt, and despite all of her efforts and magic it cannot be removed or unbuckled."
Irenicus showed her many dark things so her innocent childish attitude would fade, and let her elease the power of her father (no spoiler, right?). He let her see what he did to Dynaheir, Khalid, and probally other slaves he had captured. But he also did things to her, she mentions knives, and has plenty of scars, remember? Well, since the thing Irenicus desired wouldn't be possible to give to his sister if Imoen died, he had to prevent her from doing so in his experients. SO he gave her the belt.
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