You tell yourself, "I'm on a fabric diet for a while."
Until you end up running errands across from a major apparel fabric store and you stop in to grab some basic supplies like needles and tailor's chalk, only to find they have a sale on silk.
Or your favorite online retailer is running low on a non-reorderable fabric in a now favorite colour.
Or you realize there are a couple of gaps in your wardrobe that need to be projects, and soon.
Because that never happens when you're trying to be "good".