Raglan sleeves are very popular in knitting. Especially a
top-down raglan - a flexible design with absolutely no seaming and
pattern. It has limitless opportunities for variations: pullover or
cardigan; loose or fitted; short-sleeved, long-sleeved, 3/4, no
sleeves; any type of the neck line. The most popular way of knitting raglan designs is using circular needles.
. Nevertheless, there is one thing about circularly knit garment you should be aware of. If you look at the pattern of a seamless sweater on the left you will notice, that a neck line is not a circle, but an oval. It means that a neck line is lower in the front and higher in the back. Usually difference between them is 2-4 in for adult garments and 1-2 in for kids.
If you care about well fitting neck, you shouldn't follow any top-down raglan descriptions which invite you to begin make increases along the raglan lines RIGHT after you caste on the stitches for the neck line. Why? Because the result will be pretty bad. A neck line of a sweater will try to "clime" your chin all the time. Not too much pleasure, believe me.
What is a solution? A neck line of a garment with raglan sleeves should be shaped proper. To make it lower in the front and higher in the back, one should knit SHORT ROWS to form a neck line BEFORE you join all stitches in a circle and start to make increases . Detail explanation about doing short rows can be found at a Seamless Sweater page.
Perhaps you can knit your garment with raglan sleeves not doing those SHORT ROWS, to form a well fitting neck line. Those who don't do it will tell you:" Hey, it is a knitwear! It will be pulled once you start to wear it and everything will fit fine!" Sorry, it will not. You can not deceive geometry and your body measurements. But certainly it depends upon your requirements to quality of your work. So... choice is yours.
Very often neat stitches and accurately executed elements of a garment do MUCH MORE for your knitting than any intricate pattern. Short rows are one of those "insidious" elements. Another one is a raglan line. Those diagonal lines which run from the underarm to the neck edge, have the ability to "catch an eye" sooner that anything else. Hence, they have to look decent.
There are a couple choices here. Either design them as little
noticeable as possible or let them attract attention as decorative
To make a raglan line increases with no holes, check a Twisted Stitch page.