Factual error: It would be virtually impossible to get from Atlanta, GA to Thule (Qaanaaq) Greenland in the time-span presented by the movie. The distance from Atlanta, GA to Ottawa, Ontario is approximately (direct) 1,200 miles which would take about 17 hours of driving, not counting breaks and side trips. The distance from Ottawa to Thule is approximately 2,200 miles. Plane type? Taking a guess, range of about 900 miles. Even with no fuel limitation, flying time approx 10 hours.
Answer: In Frederika's bedroom Clarice sees the dress being made and recognises that the pieces of material are the same shape as the pieces of skin missing from the victims' bodies. In the bank, where Clarice meets Frederika's friend, Stacy tells her the address of 'Mrs Lippman' whom Frederika used to work with. Presumably Buffalo Bill is related to, or is, Mrs. Lippman since that is where Clarice finds him.
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He's not Mrs Lippman. He did, however, kill her. As Clarice chases him through the cellar, the woman's decomposing body is in a tub.