Retro sunshine yellow sheath dress, size S

Unsure of the origins of this dress, it was given to me a while back- there’s no tag and it appears to be handmade! it’s got a great vintage look to it and is in great condition. Beautiful sunshine yellow color, form-fitting, zips up in the back. The fabric is very thick and sturdy, maybe like a thick linen or canvas type fabric? but there is no stretch. Easy to dress up or down! measurements: bust: about 31 in waist: 26 in length: 34 in any questions please ask!