我有一条睡裤，用久之后内嵌的弹力绳松了，更换了之后用不了多久就又会遭遇同样的情况，我想摆脱这种频繁更换弹力绳的窘境。我想到了两种方法，方法1:更换质量好的弹力绳(经济条件不允许)方法2:使用普通绳取代(虽然没有了失去弹力的问题，但还是需要在每次穿睡裤的时候重新连结),有什么办法可以比较彻底的解决这个问题呢？(见图)

I have a pair of pajama pants, after using a long time embedded elastic rope loose, after replacing the same situation will be encountered again after a short time, I want to get rid of this dilemma of frequent replacement of elastic rope. I thought of two methods, method 1: replace the good quality elastic rope (economic conditions do not allow) method 2: the use of ordinary rope instead (although there is no longer the problem of losing elasticity, but still need to re-connect each time you wear pajama pants), what can be a more complete solution to this problem?(see figure)