I hadn't known that about shirts! In return I can share with you a rule for skirts that I learned from thingswithwings: hold a skirt up by the waistband and wrap around your neck. If the skirts touches or overlaps at the back, it will probably fit your waist and at least is worth trying on! This isn't a perfect rule because skirts are made with all different waist:hip ratios, so sometimes I go "oh, damn, it fits my waist but not my hips," but it's a good guesstimate and lets me reject things quickly at a thrift store.

My main problem with washing windows has often been living in an elevated first-floor house -- someday I have to go get a squeegee and an extension pole or something! But a thing I have learned about window-washing is that sometimes the washing liquid used by the previous tenants is waxy or greasy or something, and then they streak the first time I try to wash them. If they do, I put a drop of dishwashing liquid in the water+vinegar, and it takes the gunk-whatever-it-is off.