Answer:
Hard to catch, easy to hold. Can't be seen, unless it's cold
In buckles or lace, they help set the pace. The farther you go, the thinner they grow.
I crawl on the earth. And rise on a pillar.
It is by nature, soft as silk; A puffy cloud, white as milk; Snow tops this tropical crop; The dirtiest part of a mop
What is up that’s also down? What’s a smile and a frown?
I am your mother's brother's only brother in law. Who am I?