Vintage 1960's dress by The Kollection

Vintage retro 1960s long sleeved dress with a matching vest by The Kollection ltd. Beautiful bright while, brown, orange, and black dotted fabric. Has some stretch in the bust, but the waist is stitched. Missing a belt (there are small thread loops on side). Does have several small stains. I've never laundered vintage clothing and I'm afraid to try and remove the stains. Other than the stains, there is no other signs of pilling of wear. There is a zipper up the back and 2 clasps (one will need rethreaded loop), and button details on the sleeves. Measurements bust: 18" waist: 13 1/2" length: 39"