Yarn, drape question

Hello all,
I am wondering if anyone can tell me how to know if a yarn I choose for a sweater, or blouse will be the right type.
I do not have a pattern in mind, I just don’t want to take all that time to make something, and it sags down to my knees!
Thank you all in advance, you all are simply knitting geniuses!!

I don’t now if there’s a way to tell that unless you knit a swatch ahead of time. Since each person’s gauge is different the drape will be different for each person.

Sorry!!
Knitcindy

It helps to keep to the same fiber type: wool, plant fiber or acrylic but even then there is the possibility of disappointment. The site, Yarnsub.com tries to match yarn gauge, fiber, drape among other qualities. It’s worth a look.

Thank you ladies!