Get a grip! I'm not being judgy and I'm not trying to make anyone feel crappy! Thing is everyone is telling you that it will be ok, to cheer you up. There are myriad things which are largely unimportant to parents because they aren't a big deal, but which to children are the end of the world!
The mother in question, was not on holiday and came in with the list on the 1st day of school. I know the parent v well and I'm stating facts, as the mum told me from her point of view uniform is a waste of time for reception children, so she got the very basics at the last possible moment. It wasn't at all important to the mum, but it was to the child, I'm not being judgy I'm pointing out the situation from the childs perspective.
Personally I do think it had an impact on the child settling, thats my opinion, and i'm entiled to have one when the little girl spent the 1st 2 weeks clinging to my dd and repeatedly taking her cardigan home, what would you think? 
I'm not saying its not important to the op clearly it is, but if everyone says "don't worry about it" then to a degree the childs potential upset is being dismissed.
As for Teddies! the reception children (last year)had a teddybears picnic at the end of week 1, They took their favourite teddy's in for the 1st week.
This year the theme is "treasure bag" its a paper bag they put special reminders of home in to talk about in the 1st few weeks. AFAIA its a normal part of the curriculum. :)
and its nowhere near too late to get one delivered anyway