In Farming Simulator there are many productions, one of the simplest are sheep for the production of clothes.
First you need a place to put the sheep that will then give us wool. Sheep require little work, since in FS25 they eat the grass of the meadow, but mainly you just have to give them grass or hay.
Once this is done, just wait a bit and we will have the first pallets of wool, once this is done you will just have to buy the spinning mill.
In FS25 there are productions of the same type both more expensive so above 250,000 euros but also about 40,000 euros and six at the beginning the cheapest one could be enough.
Once the spinning mill is taken, the wool is delivered there and the latter will begin the production of fabric, once the fabric is obtained you can buy the tailoring, also more economical or more expensive this is your choice, and from there you can produce clothes as well as finished wool products.
Alternatively you can produce the fabric and clothes with cotton or you can use cotton or wool to produce ropes.