Clever re-use of an outdated coat

Check out this clever tutorial from Elna Sewing Machines re: how to re-purpose an outdated top-coat. Best of all, it has a zippered front – my favorite closure for almost any garment.

Although the instructions call for a “long enough coat or jacket,” they don’t specify whether they’re referring to an outdoor-weight garment or an indoor weight, such as a duster. Seems to me the latter would be more workable, especially for the skirt.