A bright pattern in a celebration-ready print reads as made for birthday parties. Large scale tropical prints, geometric patterns in bright colors, or abstract designs with pop-off colors work because they feel intentional and fun. The pattern should be bold enough that it actually reads as a choice rather than subtle or toned down. Bright patterns work for birthday parties when the rest of the outfit stays simple so the pattern is the story. These are the dresses that photograph well and read as ready for a good time. Look for patterns where the color saturation is actually high and the design feels current.