We typically don’t recommend dress forms in a window display – unless your are a tailor. Mannequins – even headless mannequins – are better in a window. However these two displays (from an out of print visual merchandising magazine) meet our standards.
We love that this one displays a variety of items, without looking cluttered. We are in the SF Bay Area and we rarely see men dressed in suits and ties, but this type of display still works with casual clothing.