I don't remember exactly how much shirts cost, but if I had to guess, probably $20-30?

In 2009, IIRC, labor cost was a little over $100 (VND 2.3M) for suits. Depending on the type of fabric, either Chinese or European made. Typically, for fabric only, mid priced Chinese made is about $100 or more per suit, European made could be $200-300 or more per suit. Of course, with inflation, things are probably more expensive now.