In general Mum cost their children a fortune in taxes when they live overseas with badly thought out gifts and shipping. Speaking from experience here. We once paid £25 in import fees for some candy and a couple of doilies.
You can absolutely send you own stuff from the UK to Italy in future without paying taxes. At least you can in most countries. I've done it 4 times to four counties. Though none were Italy.
The process is normally to fill in a form. Usually called sending personal effects or similar. You do this in the Destination country. You will nromally have to provide some sort of proof of identity and residence. This form is then printed out, along with a photocopy of your passport page and included on the outside of the box along with a PROFORMA invoice. You will absolutely need to use a courier. Do not use royal mail.
It is absolutely vital that your proforma invoice has every item on it, with some nominal value per item. 2-10 kind of thing for clothing. I like to use the word USED on each line.
Used socks, 5 pieces, £1 a piece, = £10
Used Jacket, 2 Pieces, £10 a piece, = £20
If you muck up and send a commerical invoice, you are screwed and will pay duty+tax.
I hope this makes some sense. There should be a page on the Italian equivalent of our .gov sites for shipping and it will be within that. Please note I am making a lot of assumptions that Italy has tthe samee thing as the countries that I have lived in. So you will need to check the Italian procedeure.
Hope that helps