The king seems to be wearing high riding boots. The fashionable gown with slit sleeves is worn atop a fitted doublet that is padded substantially at the shoulders. The collar of the doublet is visible at the neckline. Note the back v-neckline of the gown on the man in red on the extreme right.
The gown of the kneeling woman seems to be a variation on houppelande, with the collar turned down. Elements specific for the style and visible here are for example the full front, pleated when constricted by a customary wide belt (here obscured by the wearer’s hands) and the voluminous sleeves, in various styles, but generally in stark contrast with the tight, sleek sleeves of the later Burgundian v-neck gown.