Any suggestions for places to go for altering new items of clothing? Do retailers do this or should you go to a specialist alterations place?
It really depends on what you're having altered. If, for example, you're having the hem of trousers or sleeves taken up or let down, this is a fairly basic job and you're fine to let the store handle it. A lot of retailers now have access to a tailor or alteration service. The key is to ensure that the retail assistant gets the length right to begin with.
If, however, you're having more extensive adjustments done, such as side seams or shoulders taken in, or coat lengths altered, you may be best to liaise direct with a tailor or alteration service yourself. They can take the measurements direct from you and discuss your requirements.
A couple of points to note:
If the retailer is getting the work done on your behalf and they've taken the measurements, but it comes back not done properly, you have some comeback with the retailer. Check for disclaimers that may allow the retailer to disclaim responsibility.