When using a pattern and you want to increase its size, what does it mean when it says "to make it wider increase your co sts in multiples of 14+2.
Your pattern must be a fair isle, aran or textured stitch that repeats over 14 stitches across the row. I would say that you need 1 stitch at either end of the row to make the pattern repeat work at each end.
So if as an example, lets say you need to knit a piece that is 60 cms wide and your tension using 8 ply wool is 22 sts to 10 cms of knitted fabric.
To make a piece 60cm wide you would need approx. 132 sts. If you divide 132 by 14 and you get 9.42.
So you would have to make a choice, you can either do 10 multiples of 14 + 2 (142 sts) or you could do 9 multiples of 14 + 2 (128).
Using a multiple of 9 will mean that your finished piece would be slightly narrower that 60 cm (would be around 58 cms) and 10 would be slightly wider (64 cms).
Then you could play around with using needles slightly larger (for the multiple of 9) or smaller (for the multiple of 10) to get the right tension.