Similar issues, might be the same issue:
Shirt bleeds over into the pants. Seems to be an issue with this particular tucked shirt.
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Dress Pants have an issue where there's a graphical glitch at the waist that seems to take the pant color. Doesn't always appear until the sprite is exported. I've tested it with other combinations of outfit items and it doesn't seem to matter though what other items are selected does matter to whether it displays in-engine.