Make some darts, and sew in another seam in the sides or remove the seam and resew it.

On your T-shirts, cut them 1" longer than you want & turn that up for a hem. Stitch with a double needle from the right side. You have to feel the part turned up & make sure you stay on it.

You may have to take the center front & back seams up in your sweat pants & then the inseam. Unless you use a serger or a small zigzag stitch, the seams will pop when stretched.

I would treat myself to a few new sweats and regular slacks as they are now on sale and not that expensive at Walmart and other discount stores. Since you lost weight, you can wear nice clothes again and not hide in sweats.

Please know that any seams sewn on 'stretch' fabrics really need a serger. A regular seam on a 't' shirt will be rigid and not stretchy. You could probably get away with a regular seam on the outside of the sweat pants, tho.

The sweatpants can be sewm with a narrow zig-zag stitch. You will need to take out the elastic in the waist, then stitch the excess out of the sides. Try on the pants and turn down the needed amount to make the crotch the right and resew the elsatic. This is really a remake; I agree with the one who suggested new sweats. Unless you have expensive pants, it just isn't worth the work that is involved.

When I was losing weight, the elastic waist still fit but the legs of the pants were too wide. I sewed a new seam on the inseam and sewed a new seam on both sides of my tee shirts. Colleen