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Avoid flats with long skirts. In many cases, though not all, flats worn with maxi-skirts can make a woman look dowdy. If you do wear ballet flats with mid- to maxi-skirts, consider a less-than-flat ballet flat with a slightly elevated heel. Select a pair of less decorative flats for casual occasions. Otherwise, you risk making your legs look disproportionate. You may choose a formal style, such as a simple flat made of black or brown leather. For example, try matching a decorative pair of flats with a nice sundress for a garden party or other outdoor dress-up occasion.

Summary:
Wear flats with knee-length or above-the-knee skirts, capri pants or Bermuda shorts. Select a pair of decorative flats to dress an outfit up. Also avoid flats with skinny pants unless you have narrow hips. Avoid casual flats at the office or in other professional settings. Consider flats for some semi-formal occasions.