I love to crochet bolero, because bolero patterns are easy and bolero looks fancy. I've made a summer bolero before, so I wanted to make winter bolero.
I made the bolero's sleeves short because I wanted to wear the bolero underneath a winter coat. Crocheted/knitted long sleeve are sometimes too tight under a coat.
I used a pattern called Diamond Cross Trellis for my back. It's a beautiful pattern, but it is difficult to make.
To make a collar, I worked 2 back post double crochet and 4 front post double crochet repeatably on the edge.