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I'd want more LS onesies since you are having a winter baby. For both of my kiddos we did almost only LS from October-April as infants. Also more pants to match with the onesies, and sleepers in 3 month size. With kids in daycare (so we have to leave extra clothes there) we found about 12 outfits/size was enough, with maybe a few special occasion outfits.

As a NB, all I dressed my kids in were LS sleepers. Both of them only wore size NB for about 3 weeks though. We got by with about 6 of them since we were home all the time and had family to help with laundry.

For our Dec baby, I am concentrating entirely on long sleeve onesies and sleepers, so I'd get a bunch more of those. I think I am going to try to have maybe 10 each in the 0-3 size (maybe 5 in the newborn size since they grow out of that so fast). Also a few pairs of thick socks, some hats and mittens (both in lightweight and thick, the light mittens mostly so he doesn't scratch himself), bunting, and heavy swaddles for nighttime.

I know from past experience that I absolutely hate putting little babies in little outfits (pants, sweaters, etc) so I'm avoiding those this time, but some people love to dress up babies so you never know. I'm 100% certain that we will get enough of those from relatives to get us through the holidays so I am not going to buy any myself. (MIL already bought us one little outfit with a shirt and overalls and both DH and I took one look at it and said "wow that will be a pain to get on" lol).

If you are measuring ahead I would focus on 0-3. NB clothes didn't last long for my big baby. If you don't mind the look of baby girl kind of swimming in clothes right at the beginning.
Definitely more pants (footed) and sleepers. Do you have hats and socks?
The other determining factor is how much laundry you want to do.
Also, you can stick with what you have and do some online ordering when baby shows up. I place a lot of online orders at Carters and diapers.com.

I was expecting a bigger baby, I ended up having to send my husband out to get some sleepers in smaller sizes!

I personally didn't even bother dressing my son in outfits, but I did change him every day...he'd get a bath at night and get a fresh sleeper. When he stretched his first morning wake time past an hour, I began changing him out of his nightime sleeper to a day sleeper.

I would get more pants (ones with feet are awesome) and sweaters/ sweatshirts in the 0-3 month size and just layer over the short sleeve onesies, plus zip up sleepers, hats, and socks. I got way less clothes for my second baby since we tend to do a load of laundry every other day in my house any way and it wouldn't bother me to run a load every day (DD likes to put clothes in the washer and dryer so I count laundry as toddler activity rather than chore).

Agree with @katsupgirl: that you don't need to buy a whole lot of NB! My daughter wore that size for a week or two since she went from 8 lb 3 oz when we left the hospital to over 9 lbs after a week (and I have a few friends whose babies could never fir that size at all). You can get 2 day delivery from Amazon and they have a ton of baby clothes if you feel like you need more.

@MountainBaby: there are a few versions if carters. Target has one line, Kohls another. The stores won't take each others stuff which I found annoying after my shower.

I'd skip dresses until your baby is walking. They trip on them when crawling and they are a pain to buckle around for car seats and strollers.

We pretty much did sleepers at night and long sleeve onesies with soft pants during the day. We have a few knit jumpers that we used when we had guests. I found their button crotches to be a pain otherwise.

I'd grab a couple cardigans and some zutano booties to add to your list.