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They were an essential kind of pants–jeans, naturally, blue but not that stiff, new blue that you see so often on the first day of school.
- stiff
 
堅い、固い、こわばった、ゴワゴワする
They were a soft, changeable blue with a little extra fading at the knees and the seat and white wavelets at the cuffs.
- changeable
 
変わりやすい、気まぐれの、移り気な
- fading
 
徐々に色あせる、消えていく
- seat
 
〔ズボンなどの〕しりの部分
- wavelet
 
小波、小さい波、さざ波
I guess a thrift shop is like the pound in some ways.
- thrift shop
 
リサイクルショップ、中古品店、古道具屋、古物商
Our pants weren’t like the neurotic puppy whose parents left it alone, barking itself hoarse from morning till night.