Should not be too hard to repair if you are handy with a needle and thread. All fixes are on seams. I would guess this is a size x-small/small. Soft and cool fabric. Mabybe a blend of rayon and poly.
The VTG 60's LIBERTY HOUSE by SYDNEY DRESS HAWAIIAN BRIGHT FLORAL BUTTONS XS/S would be an excellent fit for dress-up occasions, vintage clothing enthusiasts, or collectors seeking a unique and stylish piece of Hawaiian-themed clothing.