One way is to use a layering tool to wear what you want the rest of us to see, and wear your disguise outfit the normal way (we see the layered) - game will use whichever clothes have the higher disguise so the hidden clothes work like normal.
You can buy the tool or with handicraft skill (R5 I think) - tavern lady and the materials required you can get from the shopkeeper (sewing kits + dye stuff)
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You can buy the tool or with handicraft skill (R5 I think) - tavern lady and the materials required you can get from the shopkeeper (sewing kits + dye stuff)