"HLB" is reported to stand for Harry L. Breslow, the founder of the company, which made both civilian and military clothing.
HLB Corp., NY had contracts for flight clothing with both the US Navy and the USAAF before, and during, WW2, however neither your jacket, or trousers, conform to any wartime military products. These appear to be either civilian, commercially available items, or of pre-war military vintage. A close look at the labels could probably determine which, as military production should include a contract number that would indicate which service they were made for. As pointed out previously, the boots do appear to be similar to USAAF A-6 winter flying boots. The Navy did use a leather electrically heated suit during wartime, however it was one piece and did not have a fur lining. If electrically heated, you would be able to feel the wires inside and there would be a cord with plug for the electrical connection. Based on what information you provided about the original owner, being affiliated with a local collage, it sounds like he was possibly a civilian flight instructor in the Navy's aviation cadet primary flight program.