I love the look of mixing floral patterns with stripes. I feel like it lessens the girlie factor of the florals by pairing it with stripes, for an overall textured and interesting look. Here are some examples...
I love this
cardigan. Worn over a pretty floral
dress, and you have layers of fun.

A fuller
skirt with a striped pattern, paired with a florally
top makes for a pretty outfit.

I love wearing summery
dresses into fall, which means layering them over a longer sleeved
shirt for added warmth and even adding tights and boots. I think this duo is cute.

A simple floral
skirt, with a simple striped
t-shirt makes for an interesting outfit.