Do swim shorts interfere with swimming (for a gym class)?

Anonymous

We're starting swim class next year and since it's co-ed I want to wear swim shorts over my bathing suit. But shorts aren't allowed which make swimming harder so I was wondering, guys who are used to wearing swim shorts, do just ordinary swim shorts interfere with swimming?

Specifically, the regulations are:

Girls: one-piece swimsuit, swim cap for long hair, optional swim shorts (above the knee)
No street clothes or swim shirts, no excessively loose shorts which impede swimming

Boys: swim shorts (above the knee) or speedos
No street clothes or swim shirts, no excessively loose shorts which impede swimming

Do swim shorts interfere with swimming (for a gym class)?
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