Hiking boots?
Cabelas has a vast assortment of hiking shoes/boots. Or you can try Lands End. I prefer Cabelas.
Flag-toting man puts boots on ground to honor military
Hamilton marveled at Ronzio's worn-down hiking boots. "I was very impressed with Terry; he's a very passionate and a very patriotic guy," said Hamilton, 26,
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Griz turn the tide last weekend against Northern Colorado and NAU
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He was wearing a grey knit cap and a grey-lined three-quarter-length jacket, a black shirt, black pants and black work or hiking boots. and more »
Texas Traveler: The South Rim and Emory Peak
I have on brand new hiking boots, worn only twice before, and I know this is a big no-no but I have never owned hiking boots before, so I had to buy a pair.

Cabelas has a vast assortment of hiking shoes/boots. Or you can try Lands End. I prefer Cabelas.
If your work boots are broken in and comfortable, go with them! Newer boots may not conform to your feet comfortably, and the trail is NOT the place to find out!
Good luck!