At first when you pick up the abandonded sack you think it's filled with gold but when you open it you find a perfectly good suit of chain mail instead.

最初，你捡起那只遗弃的布袋，以为里面装满了黄金，但当你打开它之后发现里面是一件漂亮的锁甲。

youdao

He had on a black sack suit, a cotton shirt with collar points, and a floppy black bow tie.

NPR: Excerpt: 'World Made By Hand'

In his column, Mair also commented on his upset at seeing "screengrabs and clips of the eminent and likeable Boris Johnson being badgered by a balding sack of potatoes in a cheap suit".

BBC: Eddie Mair interviews London mayor Boris Johnson