How do I shrink my clothes?

Factual Questions
1

I’ve been losing weight, and intend to continue. I am quite overweight, and my current clothes will look ludicrous on me. I don’t have much money. Is there a reliable way to shrink clothes that have been used for a long time? New stuff (I think) can be shrunk a bit fairly easily, but these are older shirts. I love my T-shirts, and have about 15 that I would love to shrink a few sizes.

It may not be possible, I know. And I’m not sure I’m interested in sewing them…

hrh

2

It used to be that clothes with natural fibers would shrink if washed in water and heat-dried. Nowadays, clothes made with cotton are mostly pre-treated to avoid shrinking. I know of no other way to deliberately shrink clothes.