In the biography 'Grace Kelly:The Secret Life of a Princess' by James Spada, Grace's trousseau is mentioned.
She 'hired fashion consultant Eleanor Lambert to help her and purchased $25,000 of clothes from New York's most celebrated designers.' These included ' a $7,000 sable coat, $4,000 mink, six cocktail dresses, four light dresses, two evening gowns, two ball gowns, a leopard skin coat, two light jackets and 20 hats.'
The author wrote 'The studio gave Grace a bonus of over $65,000 for 1956 and kept her on a $1,500 weekly salary for several months after the wedding.'
'MGM designer Helen Rose created Grace's $7,226 wedding dress, and the studio provided 'free of charge, a studio hairdresser for her first few months in Monaco.'
So also once she was Princess of Monaco she also got everything free of charge? Designer clothes? Private airfare, just everything that didn’t have to do with royal/government tours? Grace lived in a Paris apartment at Avenue Foch whose to say she paid for that as well?