TWICE Sana‘s “short” dress at a recent schedule has sparked mixed reactions. TWICE’s Sana | @m.by__sana/Instagram Recently, Sana left for Milan to attend a fashion show for PRADA, teasing her appearance on social media. View this post on Instagram A post shared by 사나 𝚂𝚊𝚗𝚊 (@m.by__sana) On January 19 (local time), Sana attended…