I think the term "scientific method" as normally used in English does not pick out any actual cluster of behaviors or practices.

The term "scientific method" as ordinarily used is associated with the traditional rituals of "Science", which are themselves unsatisfactory, or at best an improvable-upon approximation to what really works in finding out about the world. The more useful cluster is the one hereabouts called Bayesian epistemology. It can and should be practiced everywhere, and if a fashion designer employs it, it is just as useful to call it that as when a scientist in the laboratory does.