I am wondering how on-line shopping works & what is recommended. I need to try on lots of pants & shirts even though stated measurements should fit me- many are just too tight or too loose, the seat is too small or too baggy, etc. If I ordered something and it doesn't fit right, who pays to ship back & try again? Are any sites better than others? Or, should I just look at what I currently own that seems to fit and try there first for replacements.