I've messed up - is the email polite enough?

[KatyMac]

I bought too small a size - she said to buy a bigger size but I thought I had

Does this make sense?

Hi

I'm really sorry the leotard I bought is too small (I had bought what I thought was a bigger size as advised......she's only 12 & tiny so wears 10-11) - can I order the next size up please?
I can't really return this one as I don't have the packaging - so I guess I'll try to sell it on.

Just order the next size up anyway if you intend to sell the wrong one.

Won't they think it's odd if I just buy the size?

Sorry , I am confused now

I just thought they'd think it was odd if I didn't explain what I was doing

I suppose they don't really care [foolish]

If it is a company you were buying from I don't think they will mind at all what your reasons for purchasing were....just that you were buying.

Silly aren't I?

why can't you exchange it? it's worth asking even if they say no

I guess - just seemed a bit presumptuous

She is changing it - just like that

How nice

:-D