Nearly every disappointing result comes from one of a small number of input problems, and fixing the photo works better than regenerating the same input repeatedly.
If the garment floats or sits at the wrong height, the source photo was probably cropped or taken at an angle. Re-shoot straight on, full body, camera at chest height. If the fabric looks flat or pasted on, the garment image was too low-resolution or too heavily styled, so find a cleaner product shot.
If your arms have merged into your torso, move them four to six inches away from your body and try again. This is the single most common pose problem. If colours look off, your photo's white balance is fighting the garment's, which neutral daylight fixes. If your face looks subtly wrong, turn off beauty-mode smoothing and shoot near a window instead of under a ceiling light.
One check applies to every result: did your proportions stay yours? A correct render changes the clothing and leaves your body alone. If you have been slimmed, stretched, or reshaped, treat it as a failed generation rather than a preview of the garment, and run it again.
Fine detail on graphics and text remains the hardest case across every tool in this category, so a large logo or printed wording may not survive perfectly even with good inputs.