JAileen -- I find that STP's customer service has gone waaay downhill. They got bought by the TJMaxx group last year and I suspect there was a big shake-up in management and policies, because my experiences there recently have not been great. The blacklisting is so unfortunate -- not a good tactic, IMHO. There's a new brick and mortar STP in my hometown (about 2 hours from where I live now). I've been in once and was not impressed by the selection.
Gradfashionista -- I only have a car part of the week, and it does make life more complicated. I have to plan my errands carefully, and I'm learning how to take full advantage of the bus route. Luckily, my toddler loves riding the bus -- car-free days are actually his favorite!
Aziraphale -- I definitely contact CS re: garment measurements on a regular basis. I'm almost always right between XS and S, or right between petite and regular, so knowing the exact inseam/hip/shoulder/etc can be make-or-break.
Thistle -- Shoes sizing fluctuates so much, even within a single brand! I've bought the same trail runners three year in a row, and each year I've been a different size -- but lined up next to each other the three pairs look identical. I find it frustrating that athletic shoes now seem to get redesigned (revamped -- literally!) every year; I'm always worried that the shoes I love will have disappeared by the time I need to replace them.