The internet is a good place to purchase vintage fashion items and there are many specialist shops that have their own websites, as well as several internet auction sites where bargains can be found regularly.
When purchasing online, be sure that you have a full description of the item that you are interested in. If not, contact the retailer to obtain more details. Vintage clothes are by definition old, and more than likely, used. This means that there could be signs of wear and tear on the item and maybe even a bit of damage. By obtaining as much information as possible you are avoiding the possibility that you may end up with an item that is unusable.
You should also obtain the accurate measurements of the items. Dress size calculations have varied a great deal over the years and you need to be aware of individual measurements of bust, waist and hips, not just of the item, but of yourself as well.
It is a good idea also to ensure that you check with retailers to find out if they offer insurance on deliveries. If you are paying for a classic vintage item you may be spending several hundred pounds, so insurance will be necessary if the items are lost or damaged in transit.
Internet auction sites such as eBay are favoured for the purchase of items such as vintage handbags, as when many people clear out their wardrobes they are now more inclined to sell, than to throw away.