1. Examine your garment carefully. Be sure to look for any care labels and/or content labels for any information that might be helpful.
2. There are many stain removal methods that are specifically for delicate fabrics. Once you know what type of fabric you are dealing with, you can then find the correct method.
3. Dry Cleaning is not always safe for vintage clothing. It is usually safe for cotton and linen. You will want to find a dry cleaner that is familiar with delicate fabrics. Hand washing is best for some items.
4. If you are purchasing museum quality items for a collection, it may be best not to clean them at all, but proper storage will be very important.
5. If you notice any signs of mildew or insect infestation, you will want to isolate the item immediately.
6. Remember that light, insects, heat, dirt and moisture are all enemies of vintage clothing. You will want to store your items in an area of your home that has good circulation and is away from sunlight.
7. The only items that can safely be hung on hangers are those that are made of strong fabrics and don't have delicate shoulders. Heavily beaded items should never be hung.
8. Store delicate items in boxes with layers of cotton or muslin sheeting. NEVER STORE IN PLASTIC! Just remember that vintage clothing needs to breathe.
9. If you choose to use hanging garment bags, use those made of a breathable fabric.
For more specific cleaning tips, here are some websites that I think give good information:
http://dept.kent.edu/museum/staff/care.html
ALIX OF MIAMI VINTAGE FLORAL 50'S DRESS