red dress girl Girls Birthday Laura Lace Dress and sophisticated Girls Birthday Dress Fiona Dress

Includes an adjustable belt to cinch the waist and create a flattering, defined silhouette

That applies to every style

The consistent principle: neckline should be clean enough that the regalia not the dress is the focal point

Theory Treeca Pant Sizes: 0018 with a 25.5-inch inseam | Materials: Wool, elastane | Cut: Slim-cut, suit-style leg | Design details: Hook-and-zip closure, front slant pockets | Price: $$$ Theorys Treecas are the business-casual equivalent to the perfect pair of boyfriend jeans, says Catherine Smart, co-founder of Not Just Co

Made from a comfortable blend of polyester and elastane, it offers both style and stretch