Print ready artwork will always be requested for decorating promotional products i.e. screenprinting, embroidery, pad print, engraving). This refers to Vector files i.e. original artwork produced by programmes such as Corel Draw and Illustrator.
A vector file enables easy scaling of a logo or design without losing detail.
Your promotional product company will advise you of the print requirements and any specifications for setup, such as trim/bleeds and print colours.
If your artwork isn't 'print ready' and you only have a jpeg or tiff file, don't worry. Your promotional products company (like Thrive Promotional) can arrange a redraw.