Australian Governor-General Sir Peter Cosgrove and his wife Lady Cosgrove present a toy kangaroo and a pair of small ugg boots to Prince Harry and his wife Meghan for Baby Sussex, now Archie Harrison Mountbaten-Windsor. Credit:AP

Los Angeles: Australian ugg boot-maker Eddie Oygur has suffered a $US450,000 ($643,000) loss in his "David versus Goliath" legal fight with a major US footwear and apparel company.

A jury in Chicago on Friday found Oygur's business, Sydney-based Australian Leather, wilfully infringed a trademark registered to California-based Deckers Outdoor by selling ugg boots online to customers in the US.

After a four-day trial, Oygur was ordered to pay Deckers statutory damages of $US450,000 and he may face an order to pay millions more in legal costs.