Clothing product photography?
Stop the lens down to at least f/4 (if not more, but I assume you want to background out of focus)
Clothing backgrounds are 95% the same colour (ie: black or white backdrops)... look in most catalogs. You want maximum sharpness to show off the clothing details. So not F/4, but likely something between F/8 to F/16. Ideally you will be knowledgeable enough to find the sweet spot of your lens and shoot at that one aperture all day. Most lenses are between F/7.1 to F/13.
I am not a big fan of the constant on lighting... they are HOT, uncomfortable and dangerous. Halogens are weak, inconsistent WB and you get your money's worth... ie: cheap lights = less than ideal results. For a few bucks more one could get a speedlight that is portable, better quality light, safer and cooler for the models... plus the results will always be better.