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The would likely pull the shorts down or up as the tissue above and below is removed and eaten away. They may tear small portions of the fabric off at a time. However, as they begin to feed on the tissue there they would bite deeper, removing bites of flesh with the overlaying clothes. At the bottom of the water portions of the swim trunks may be attached to the bones also. They would first grab the larger, more meaty portions of tissue first. Feeding on the buttocks first and then working the way to the front. The tissue inside the pelvis may be harder for them to reach also. In this regard they then may need not be able to remove all of the tissue. The smaller fish may have to pick through that pelvic region to remove the remaining tissue as it is tighter in between the pelvic bones.