Washing Vintage Clothes ?

Does anyone know the best way to clean vintage clothes ?? I am afraid to wash them because they are so old. I purchased about 100 pieces from an old store here in Jasper, after the owner died. The dresses are from the 40-50's, that where hanging in the old building for over 60 years. The clothes are in remarkable condition and are not damaged, but smell and have a few rust stains on the inside from the wire hangers ?? The amazing thing about the clothes are that they were all made here in the USA, nothing from China or overseas ?? So, I know the clothes are very sturdy and are of high quality. If you have any suggestions, please let me know. Thank You, Kat