Looks like during vintage era, Kenner refused to sculpt or paint boots (example Bespin Han with boots the same colors as his pants, anh Luke same case; others who wore shoes didnīt have them painted: Bespin Lando, Lobot, Tusken, jawa, etc.
Ugnaught didnīt spot boots in the eighties, but his unique pig feet under special pig shoes.
Later vintage potf produced more characters with black boots; like Carbon Freeze chamber Han Solo and Endor Leia in battle poncho, but Kenner omitted to piant the yellow stripes on both sides of the pants.