What surprise did Jem encounter when he returned to the radley place to retrieve his pants? why did it upset him?

He notices that his pants were folded up on top of the fence. The tear had been mended though not too neatly. I'm not sure that Jem was upset more than confused.

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Hi Amanda. How r u doing?

"THEY'D BEEN SEWED UP. NOT LIKE A LADY SEWED 'EM, LIKE SOMETHIN' I'D TRY TO DO. ALL CROOKED. IT'S ALMOST LIKE-"