Anicca: Impermanence
Everything formed wears out. Grass standing green at dawn becomes oven fuel by the next day, and it was still dressed well for the one day it had. Your body wears its clothing on the same short lease, kept warm for a season and then set aside; the shortness of the lease is no argument for going bare today.
Paṭicca-samuppāda: Dependent arising
Things come about through conditions. The grass spun no thread of what it wears; rain, soil, sun, and season did the weaving while it stood still in one place. Your coat arrives the same way, out of cotton you did not grow and by hands you never met, so the sense that the whole supply rests on your own effort is already false before the worrying starts.
Uddhacca-kukkucca: Restlessness and worry
Worry is one of the five hindrances that cloud the mind. Turning over next winter's coat while today's is on your back adds not one thread to either, and a whole day can go into it without producing either one. The oven comes on schedule regardless, so the churning costs the green morning that was there to be had.
Santuṭṭhi: Contentment
Contentment is resting satisfied with what has arrived. Grass wears one plain green coat and reaches for no second one, and that sets the standard: cloth enough to keep off cold and heat is the whole requirement. Spoken not long after the man who pulled down his barns to build bigger ones, this puts the floor of need low enough that it is already met, and fear needs an unmet need to live on.
Saddhā: Trust
Saddhā is confidence firm enough to act on. Being addressed as one of little faith marks a shortage that can be filled, and it fills the way trust always does, by testing: watch one field through a full turn of the seasons and count how often it stood bare. Confidence built that way releases the attention worry was consuming, and released attention is what does the work of practice.