Who here can NOT stand twisted elastic bands?? I see all the hands up. I'm with you. It's ridiculous and annoying and too often becomes a piece of clothing that doesn't get worn. We want clothing that we can be comfy in and don't need to adjust every so often.
In the case of the bands/cuffs you will need to stretch them to match their corresponding pieces. But how can you be sure you've stretched them evenly across the garment? And gathered skirts/ruffles (as the name implies) need to be gathered down to size to match their corresponding pieces. Again - how can you be sure to gather and distribute them in more even amounts?