I googled it - decided it wasn't going to be too hard - and gave it a go! (tutorial here and another here!)
Here's what I did...
It did make a huge difference to the overall appearance of the shirt Oh and the Husband!) and I would defiantly do it again if he wears out other shirts or I see one at an opshop that I like and it has a worn collar.
It is an easy way to add life to a worn looking shirt of any kind!
Green-ness: 5/5 for not using any new materials and getting a longer life out of the shirt.
Frugal-ness: 5/5 for not spending a cent!
Time cost: It took me a few minutes to remove each collar (there are five of them!) It takes a few more minutes to pin it on - especially the first time. Only a few seconds to sew, but if you don't catch the collar on both sides of the sticky uppy bit - you have to unpick it and start again. Took me about an hour to do all five in the end.
Skill level: Basic sewing - just fiddly to get right the first time.
Fun -ness: Great fun the present the Husband with shirts that look a lot better!