Did you know that the same garment can look completely different depending on which materials you choose to make it? Here is an example of how the choice of yarn gives these two jackets different expressions.
Fluffy and elastic or firm with clear lines? The choice of yarn gives different expressions.
Look at those two cardigans. They are knitted with the same pattern.
The green one is knitted with a super bulky yarn, like the pattern calls for. It is easy to see the shape of the finished garment. The fabric is firm, still the jacket is soft and warm.
The white one is knitted with a fluffy, bulky yarn. Each stitch is a little bit looser with this yarn, and that gives the fabric some more of elastic. It also softens the lines of the shape.
The choice of yarn will of course have an impact on the finished garments weight. In this example the green cardigan is 1 kilo and the white only 275 grams! But that does not necessarily do anything to the expression.
At last, the question is what need the garment is meant to cover. Choose the yarn that gives both the wished functionality and expression.