According to Jim Wiki
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During the scene where Jim fist comes down the stairs wearing his kilt, you see him do a twirl to show off his new duds. As he spins, the kilt raises in the back showing what he really wears underneath. Most syndicated airings of this episode have edited the twirl out since the original airing. Bootleg copies can be tracked down on the internet; I'm not sure if the DVD release maintained the scene.

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