I have definitely bought too many clothes lol!
I bought some newborn vests that are actually the same size as "up to 1 month" or "0-3 months" in other brands. I've ended up with loads (about 14 colourful vests, and 3 plain white lol). At first I was worried they'd be huge, but now I'm worrying if the baby is 'big' it won't fit them very long as others have said they fit from about 7lb to 10lb...
If the baby is big I'll just have to sell some online and buy 0-3m instead lol.
I have 8 sleepsuits in newborn size at the moment, 5 colourful, 3 plain white. (white ones for bedtime and patterned ones for daytime/going out lol).
I don't like outfits right away as I'm not keen on waistbands on newborns, so would stick to vests, babygrows, and soft dungarees etc for the first few weeks at least.
I'm hoping it's quite warm (July) so no need to put the baby in more than a vest most of the time (I do also have socks & slipper socks to keep their feet warm, and they will be in a sling a lot too).
Otherwise I'd buy more babygrows.