So, what exactly is the difference? Well, a lot really.
Most brides will enter a bridal salon and buy a ready-to-wear bridal gown which may need alterations for length and fit.
The next option is made-to-measure.
Made to measure is a wedding gown made to order from an adjusted block pattern. You may find a strapless gown and add straps to it. You may find a zip up back closure but prefer a corset or lace-up. All that happens with made to measure is the basic pattern/style is adjusted to a clients specific needs.
A bespoke gown is traditionally cut from a pattern drafted from scratch for the customer. A design will take place and the pattern will be drafted to that specification. There is no basic pattern block.
So, that's cleared that up. x