How To Let Out Pants [Tutorial] : If you've ever struggled to button a pair of pants be sure to check out the Letting Out Pants tutorial. This helpful link will show you how to make pants bigger by letting out the waist. If you are a person whose weight often changes then this can be an extremely helpful trick. You don't need to go out and buy new pants if you have gained a few pounds. Keep your old pants and simply make them more comfortable by letting out the waist with these easy steps.