just knitting a handy guide for all hand knitters!

Even the most experienced knitter gets a little nervous sometimes about knitting the right size. Knitting for yourself or family member is relatively easy - I find the best way is to measure something in a similar style which you know fits well.
Knitting patterns offer instructions in a range of sizes and specify the actual dimensions allowing room to move, as well as the ‘to fit’ measurements. You may need to adapt the pattern for sleeve length and/or overall length for a shorter or taller person. It’s important to add or take away extra centimetres before shaping the front or back for the armholes. If you don’t, the pieces won’t fit together. Similarly, when knitting a sleeve, make any length adjustments before shaping the top.
It’s a good idea to circle your required size on your pattern in case you take a long break from your knitting and forget the size you were following when you return to it.
Perhaps the hardest sizing is for a baby/small child outside the immediate family. We want to knit something for that newborn or toddler, but have no clear idea of what size. Below are the standard measurements recommended for different ages. If you vaguely know the baby or child is particularly small or large for their age you can adjust, but there is little harm in making something a bit too big for someone in this age group as they grow so quickly. This table is for chest measurement, which is the usual way of sizing for children. Overall lengths and sleeves matter less for babies.  Generally, two inches ‘roominess’ around the chest is allowed, though knitting patterns often increase this gap for aran or chunky knitwear which may be worn over a thicker shirt.