In 1954, Frenchman Daniel Tribouillard joined the textile firm of Jacques Leonard. In 1958 the company decided to expand into garment-making, and Tribouillard was made the designer of this new business, Leonard Fashion. The company was known for their brightly colored prints, which are ofter compared to those of Pucci. Starting around 1970, Leonard used a printed silk jersey for their designs.source: http://vintagefashionguild.org/label-resource/leonard/
Leonard is still open today, with over 100 boutiques worldwide. The designer is now Veronique Leroy, with Daniel Tribouillard acting as CEO of the company
This is a great website to use when trying to identify vintage clothing, especially when you've found an old tag that doesn't look familiar.
The dress is a tad too big, but I'm trying to alter it and if not, then I'm sure to find it a happy home.
excuse the bins in the background...