If you really love vintage and want to wear something authentic either on your wedding day or to some important event, be aware manufacturing techniques back then were different. The invisible zipper that simulates a flawless seam just didn't exist back then. In some dresses circa 30s-50s you'll find seams pinked (simply cut with pinking shears) or zig-zaged rather than lock-stitched. If you're a purest or plan on wearing your vintage find more than once, find an expert in restoration. Ideally, one who loves vintage will relish working on authentic pieces and share your vision.