Yes, many jammers are so low you wonder about water going into the suit (tunneling) and slowing a swimmer down. A US college swimmer told me a few yrs. ago the jammers were better than briefs because the tight fabric around their thighs gave added support to thigh muscles that get tired quickly in a race. Also, many fabrics are slicker than human skin, so covering more of the body helps you be slicker (and faster?) in the water.
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