OK, I've always gotten pretty much what the gauge suggests, so I've never had to adjust....
The pattern I am starting says the gauge is:
18 st and 30 rows = 4" in st st
The pattern calls for size 7 needles and DK weight yarn. I did a swatch, and I got 21 st in 4" on size 7s. This means I should go to a larger size needle, correct? and if I need to go up to a size 9, is it still going to look nice on DK weight wool? It's a baby girl's dress with a pretty vine pattern in it, and I want it to look nice.
As for the size, I am doing the size rec for a 20" chest and the next one up is a 22" inch chest. the CO is 182 st (and co for the larger size is 195). Would it be better to stick with the size 7s (for a nice looking garment) and co the 195 to account for the extra stitches per inch, or go with a larger needle and co the size I need?
**ETA DD's chest measures almost 20" (more like 19.5").