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How to make such edgings? I have tried to just adding additional loops but i got bad result enter image description here

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Simple answer: model them.

There are many different kinds of seams on various furniture so it is essential to have good reference photos and see clearly how they look so you can then decide what will be the most appropriate method for modelling them. The ones in the picture seem to be simple piping seams. If you Google 'piping seam', you can find pictures and even videos how they are actually made and see that it is basically exactly what is sounds like - just a pipe going around, that is sewed into the seam to hide it.

I would recommend to model furniture with correct peaces of fabric so there will be seams on your models in the places there would be seams in reality. This helps with texturing and if you have UV seams already marked it is very easy to select them in edit mode with shift+g > Seams. Once selected you can duplicate them with shift+d and separate them with p > Selection. Then you can hit alt+c and convert the edges to curves. Once you have curves it is very easy to make pipes out of them just adding some bevel and adjusting it's resolution in the curve tab in the Properties Editor:

enter image description here

You could also use another curve as a bevel object if you needed a more complex form. Also because you now have them as curves, you can use more complex geometry and deform it with Curve modifier to follow the shapes of these curves. This way you can model various complex patterns for classical furniture:

enter image description here

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I guess it depends on the degree of detail you want, if you need something simple you could do it this way:

  • Duplicate the edges, separate them from the object with P and convert them to Curve with alt C.
  • Create a new Curve > Circle.
  • Select your edge curve and in the Properties panel > Data > Geometry, choose the circle as Bevel Object.
  • Change the circle dimension or shape until you're satisfied.
  • If needed, convert your edge curve to Mesh

If your profile is more complexe than a simple circle, create a segment, give it an Array modifier and a Curve modifier with your edge curve as the Object so that your segment will follow this curve.

enter image description here

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  • $\begingroup$ If it's a simple circle you are using for a bevel, a separate bevel object is not needed. The default curve bevel makes a circle. Saves a few clicks and then you don't need to have circle floating somewhere. $\endgroup$ – Martynas Žiemys Nov 1 '18 at 20:40
  • $\begingroup$ sure, but if you want to slightly change the shape ;) + this is not the main point of this solution $\endgroup$ – moonboots Nov 1 '18 at 20:43
  • $\begingroup$ + you need to choose Fill > Full, Bevel > Depth, Bevel > Resolution $\endgroup$ – moonboots Nov 1 '18 at 20:46
  • $\begingroup$ Good point. Who would use a bevel with half fill and 0 resolution?.. It would be nice to have defaults that make more sense... $\endgroup$ – Martynas Žiemys Nov 1 '18 at 20:57

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