Q&A for How to Take the Stretch Out of an Elastic in Clothing

Yes, for a quick fix I would take a pair of scissors and make very small snips here and there around the waist where the elastic is situated. That should allow the fabric to loosen up.

Yes, you may stretch the elastic in your socks following the same steps here.

Having the jacket zipped closed (if it's a zipper jacket) and following any of these methods will stretch the elastic.

In the answer regarding stretching elastic in clothes, one of the methods is to leave the item stretched over something (they used example of a chair) for 24 hours, or even up to several days. They also recommended leaving it in a warm area, as the heat will help the stretching. So for shoes, stuffing something into them so they are in the desired stretched out position, left in a warm area, for a day or more, ought to do it. Note while elastic can be stretched, it can be unstretched, so go easy, a little at a time. Don't overdo it.

Stretch the wet socks over a pool noodle, wine bottle, or whatever is a little larger than the tight socks around your leg.

Turn on the iron and dampen a cloth. You want your iron on and set to the highest setting. Prepare your pants. You can either pin each side of your pants to the ironing board—stretched to the desired length. Place the damp cloth over your elastic. Iron the elastic. Repeat as necessary.

Consider buying an “extender”. They have hooks at either end, and come in a number of sizes and colors. They are sold online and in many stores. This will help to give your bra more space.