Is there any harm in splashing the ablution water on our dress?
The water used in ablution and ghusl is called ‘ma al-musta’mal’ (used water). Although used water loses its characteristics to clean ceremonial impurity (hadath) it is not considered as najis (ritually impure). Therefore, such water does not make impure the places where it splashes. (Mawsili, al-Ikhtiyar, I, 70-71).
Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS