When I first blogged about this adorable dress, I mentioned the waist ran wide and suggested a few easy DIY "fixes." Per your requests, here's a step-by-step tutorial for one of my favorite quick tricks to make a garment fit better: by adding a partial elasticized waist. This is a total shortcut method, but it takes 10 minutes, it's comfortable, and it's easy to undo if you gain some weight later!
DIY sewing adding an elastic waistband tutorial
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