How to use body tape measure?

kugelette

I feel a bit dumb for asking this, but does anyone have any tips for measuring your body? I know you're supposed to measure "the smallest part of your waist"...but what if that area changes and now you're measuring higher or lower? Do you still measure the "smallest" part or do you keep measuring where you were before (let's say 2 inches above the belly button)? How am I supposed to figure out what the widest part of my thigh is? Looks pretty much the same to me for the majority of it (ditto my arms). Does anyone do bust measurements? Is that with or without bra? Do you pull the tape so it's snug around the body or measure loosely?