Not at all. By adding the appropriate layer on top,  you can wear those little dresses and still feel warm. Here are some useful “cover-up” options: 

• Shrugs need to be cropped and snug.
• Cardigans are best cropped at the waist. Longer styles can look frumpy.
• Bolero jackets can be fitted or trapeze (A-line) in silhouette depending on the style of the dress. A-line dress styles look best with short fitted bolero jackets; while straighter sheath dress styles can be matched with either. 
• Denim jackets are a casual and urban choice (especially when the wash is dark). Proportions are most flattering when the jacket is short and fitted.

Thanks to my trusty cardigans and denim jacket, I’m out of my jeans and into a dress. The extra layer also works wonders if you tend to feel exposed showing so much skin. A flirty femimine frock is always fab.

Shrug (Ann Taylor), cropped cardigan (Banana Republic) and cropped bolero (Nordstrom).