DOHA, Qatar — She knows her way around a piece of cloth.
Sheikha Mozah bint Nasser al-Missned, mother of the current Emir of Qatar, is not educated in fashion, at least not formally. But when she’s meeting with her brands — held under the umbrella of Mayhoola for Investments, the secretive fund that backs Valentino, among others — her keen eye and accumulated knowledge is on full display. Not only in the way she presents herself in waist-cinching, jewel-tone garments and kohl-rimmed…

