Cast member items are always popular with Disney collectors, but clothing doesn't tend to have great value. Condition is critical, and size is important, too. Without seeing the items, it's difficult to estimate the value. The Imagineering shirt would undoubtedly be the most valuable. I'd expect it to be worth around $25-30.00. The others would be worth less, I would think, because they don't commemorate a popular place or event. Good luck!
