It takes two to three months for orders to arrive and four to six weeks for alterations. A six-month cushion will give you and your friends ample time to find and order the convertible dresses and get them fit.
As much as businesses are competing to offer you fast and good service, its for the best to give them enough time to deliver what you need. The convertible dresses you order will typically arrive in two or three months. You must also take alternations into consideration and reserve another few weeks for that.