Hi !! I am very new here but I really need help haha. I have done a lot of research but haven’t found anything. I am knitting a marius sweater from bottom to top. I have already the body and one sleep ready. I want to « sew on the sleeve » to the body as mentioned in the pattern but I really do not know how to do that… 
Welcome to the forum!
This may not be your pattern but it gives an idea of the lovely Marius design.
How is your sweater knit, in the round, back and forth? What kind of opening for the sleeve do you have? If a photo would work, that might be helpful to us.
If the sleeve is knit flat you can use mattress stitch to seam the cast off end of the sleeve to the row ends of the body. A straight cast off for a drop sleeve will be simpler to seam than a sleeve cap with shaping but mattress stitch or a backstitch will work in both cases.
https://www.youtube.com/watch?v=Q04_-WWGpvw
If the sleeve is knit in the round and you have a circular opening on the body for the sleeve, you can still use mattress stitch to seam but it’s easier if you baste or pin the sleeve into the opening first so that it fits neatly all around, then put in the seam.
Yes ! So this is what I have so far. I have tried so much things haha I really don’t reach the point :’) it’s my first colour work and my second sweater so it is a bit messy but I am still proud of it haha but for the sleeve I am really lost. It is knitted in round. I tried the mattress stitch but I can’t find a good ratio… :’)
It looks beautiful and very neatly done. Congratulations on your second sweater.
Baste or pin the sleeve in all around so that you know it’ll fit nicely in the armhole. Then you can try mattress stitch, picking up consecutive stitches from the sleeve and picking up one or two bars from the body as needed. Often this ratio turns out to be 3sts from sleeve to 4sts from body but you can alter that as you seam. You want to keep attaching so that the sleeve/body will come out even.
The pins may be easier to use since you will take them out as you come to them but a basting thread in a contrast color would work the same way, pulled out as you work your final seam.
Thank you I’ll try that !!!
Let us know how it’s going.
If mattress stitch isn’t working for you then turning the sweater inside out and using a sewing backstitch will do the trick. It’s always there as an alternative.
What a lovely sweater. You’ve done a great job with the colour work.
I stopped by to let you know that my first few attempts of seaming sweaters were tricky, and it has become so much easier with practise. I am (and always have been) terrible at sewing, it’s just not my skill at all. However I do find knitting easier to sew than fabric because the holes are already provided and it is more a case of getting them aligned, and as you said getting the ratio.
I did a lot of counting and tacking, maybe more than other people need to because my sewing skill is so low, but it worked in the end.
As salmonmac has already said the ratio is often 3 stitches (sleeve) to 4 rows (body). In the beginning however I found I needed to count out stitches and rows and put tacking threads in to keep me in the right place.
The end stitch count of the sleeve, divided by 2 gives the number for half the armhole and this is the number of rows from underarm to shoulder. I put those two numbers side by side (a ratio) which helped me.
I counted stitches and rows, placing a thin thread in key places which must meet up (for me I did lots of them), I have even been known to place a marker on the body every x number of rows to ensure I go under 2 rows instead of 1 in the right place.
It all sounds rather labour intensive and in a way it was. But it was worth it. I was extremely proud of my achievement having never successfully sewn anything and then able to make a neat seam.
I hope it is not so difficult for you, but I just wanted to stop by and say, even if it is difficult, you will manage it and you will find it easier next time.
Another tip I saw online which helped me a great deal was to use a decent length of yarn, find the centre point and begin seaming at the shoulder with half the yarn, save the other half of the length for working down the other side , this way you’re not trying to close up the entire seam around the circular armhole at once. Instead each side is drawn down towards the underarm. I usually make a slip knot in the sewing yarn and place a removable marker or safety pin in the slip knot which just prevents me pulling too much yarn through on one side (or even worse pulling it out of the seam. I’ve done that!).
I hope it goes well for you.
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