To be honest mate they wouldn't be my first choice for window cleaning with "fit for purpose" I've been cleaning windows for over 15 years and have covered all access methods such as ladder, wfp, rope access, cherry picker and standard squeegee/applicator extension pole (ground floor work etc.
footwear wise I will wear light weight Gore-Tex shoes for 99% of my work and on the occasions were cleaning blocks of flats on socking wet grass I'll wear horse ridding muck boats which keep my feet fully dry.
Our foot wear and clothing does have to change from day to day to suit the work we are doing, certain accounts require very clean and appropriate uniform over everyday work wear