Vintage fashion sketch

Vintage original fashion sketch in color from late 50s Fashion sketch of 1950 style blue skirt suits. Looks like in water color. Framed. Frame is original one from when I purchased this in mid 80s. In great vintage condition Size (frame size) 12.5"x10" I was told by the art dealer that this sketch is from Pierre Balmain house, however, there is no signature or any information on the sketch. The design of this suits is similar to Balmain signature architectural look, but no sure if the sketch itself was done in the House. Condition: Pre-Owned Offers welcome.