فيما إذا تحرى بين الثوبين وصلى الظهر بأحدهما، ثم وقع تحريه عند العصر على الثوب الآخر
For example, a person chooses one of two uncertain garments for the noon prayer, but a fresh estimate favors the other at the afternoon prayer.
In this specific ruling the earlier judgment concerning the garment has been reinforced by performance, so merely favoring the other garment later does not overturn it; the text therefore does not permit switching to it for the next prayer on the basis of estimation alone.
The qiblah differs: where the estimated direction changes after one prayer, a later prayer may face the newly selected direction. Direction is a case in which a prospective change of application is possible; the garment illustration is treated differently.
Conclusion: evidence hierarchy, type of legal doubt, existence of a substitute, and whether judgment has been acted upon jointly determine the ruling.