Natural cleaning will minimize the yellowing with age that sometimes occurs even when careful consideration of storage is given to the gown.
Unfortunately, no process or storage method yet known can absolutely guarantee against possible yellowing or deterioration of textile fibers during extended storage.
If you choose to have your gown packed in a special box, this will aid in storage. This is a convenient way for you to not only store your gown, but it offers some protection from dust, dirt, insects and other contaminant's in the air. These boxes are made up of an inner paper box into which the gown is packed and carefully stuffed with acid free tissue paper. The box is then sealed with tape and closed with a cover/lid. Opening this cover/lid will allow a peak at your dress through the paper window without disturbing the seal.
If you are storing a long gown on a hanger, it is a good idea to sew straps to the waistline of the dress. This will relieve pressure on the shoulders from the weight of the skirt. These straps should be a little shorter than the dress bodice. Use a padded hanger covered in fabric, not a wire or foam padded hanger. Wrap the gown in a protective white sheet or muslin covering. Do not use a plastic bag for long-term storage. Plastic can trap heat and moisture.
Even after your gown is carefully stored, inspect it again from time to time. If the gown was boxed, carefully open the seal and reseal or tape after inspection. An occasional inspection will assure you that your gown is not becoming damp or suffering from heat exposure. Many fabrics have a natural tendency to yellow with age. Sometimes this type of yellowing can be overcome if naturally cleaned and gently bleached. This is not always possible however, depending on the type of fabric, the trim, and the age and condition of the garment. Natural Cleaners must evaluate each case individually. Even if an heirloom has been damaged over time, it can often be restored.
Your wedding gown is worth the attention you give to its selection and care, both before and after the wedding.