Give the model the whole garment. A front-on photo with the full item in frame — hem to collar, cuff to cuff — converts best, because the AI preserves the silhouette it can see and has to infer anything cropped out. Worn shots and physical-mannequin shots both work; what matters is that the garment's shape and details are visible.
Even, soft light beats dramatic light. The output is a product photo, and product photos want the fabric's true color and texture. Harsh side-light bakes shadows into the fabric that survive into the result; flat daylight or diffused indoor light gives the model clean material to work with. Busy backgrounds are fine — they get replaced — but avoid anything overlapping the garment itself (bags, crossed arms, another person).
Zips, buttons and closures photograph the way you present them. If the listing should show the jacket zipped, upload it zipped; the model keeps closures, stitching, prints and labels as photographed rather than inventing a different configuration. Use the additional-requirements box for specifics — "show the inside back collar" or "sleeves hanging straight" — the same way you would brief a retoucher.
And check the result the way a buyer would: neckline shape, sleeve drape, hem line, print alignment. AI reconstruction is strong on typical garments — tops, jackets, dresses, knitwear — and you should still eyeball each image before it goes into a listing, exactly as you would proof a retoucher's composite.