Go ahead and do a quick twirl in front of your bathroom mirror. It's not vanity unless you smile uncontrollably and spin more than once.
Take a peek at your backside (we won't tell and, no, those slacks don't make it look bigger), because someday youwillsit upon wet paint or a sticky food item. Let's make sure that never happened in the skirt you're wearing to work today.
Next, stretch your arms out to the sides and then straight over your head. Comfy? Ladies, take a moment to examine your "no spy" zone. That would be the grade-able (A, B, C, D...) parts just below your neckline. It is better to pin than to gape.