Billie Eilish wore a 1965-era ‘Barbie’-inspired ensemble for her emotional Grammy Awards performance. The 22-year-old singer was backed by her brother Finneas O’Connell on piano and strings players as she sang her song from the blockbuster’s soundtrack, ‘What Was I Made For?’ during Sunday’s (04.02.24) ceremony. Billie wrote a green dress with a white and green patterned coat and a pink scarf over her hair, inspired by the Poodle Parade Barbie, as she stayed seated on a stool throughout her powerful performance of the ballad. Ahead of the performance, the track had already won the Best Song Wr…