A little out of period, this picture was painted probably 10 or 20 years prior to the 1640 by an unknown artist, but the clothes worn by the group of morris dancers and the watchers show the kind of common garments that are only seen for the period in continental paintings. There is very little of this kind of thing from England. The picture is © The Fitzwilliam Museum, Cambridge and you can find more about it by following this link.
In this detail you can see the dancers are wearing breeches and shirts only, but still keeping their hats on. Must have been a nice hot day! The woman dancer has an early rebato type collar with a linen coif on her head. Notice her petticoat is short enough to allow her to dance. The clothes are old fashioned, particularly the breeches, but not completely out of period for 1640s.
The 1640s Picturebook 