ask peter tutorialHow can I add a peter pan collar to a jacket?

I'm making the jacket from the pattern Butterick b4929 ( view B. I'd like to add a peter pan collar, but I've never made that type of collar and I can't find any tutorials that are helpful. Advice, please?

I asked this already, but I think it fits better in this category. Plus, in the fashion category, I've been getting just spam answers =(.
This is what I feel I would do. Cut another copy of your mandarin collar out of extra paper - then use this to make your new collar pattern. Measure on your jacket the approximate outer curve of where you want your PP collar to be and how deep - then measure the outer side of the mandarin collar and compare to find out how much you need to increase it to get the PP collar - say your mandarin collar is 20 inches (50cm) aound the outer edge and you want the pp collar to be say 30 inches (75cm) then that means you need to increase the outer measure by 10 inches (25 mm)Make cuts at even spaces on the extra collar pattern from the outer to the inner edge(task peter tutorialhe one that you sew on the garment) but not right through to the inner edge, it needs to be almost but not quite cut right to the edge
Lets say you need to increase using these measures by 10 " -you could make 10 cuts and spead or fan the outer edge out so that the total edge is 10 " bigger than the original - make sure you stick or glue it on to another piece of paper and then redraw the edge and also a curved end like the PP collar has - if the mandarin has extra space in the front I would also allow some extra by measuring how far it needs to be extended to bring it in toward the middle from your original pattern - when you feel you have it looking like a pp collar then cut it out and use it to make your new collar after double checking to see if it looks right, perhaps it would also be a good idea to cut a collar first and drape it on your new garment to see if it fits ok and needs any alterations and sits right . Please note the measurments are only a suggestiask peter tutorialon as I have no idea of your collar pattern - the actual measurements need to be worked out by you and the amount of cuts you make also depends on you - hope you can understand my logic and that this may help
Cheers
Megsy
Yes, you can change the mandarin collar to a peter pan to fit this pattern. You will need to find a pattern for a peter pan collar and then you can adjust the neckline edge to fit the neckline of the jacket (you may have to cut away some of the edge on the side that makes a seam with the neckline of the jacket or you may have to add some - depends on how they fit). The key thing with peter pan collars is that the right and left sides should touch in the front and the back. So, you may have to make an adjustment to the outer edges as well.

I have done this type of pattern alteration many times, but it might be hard to describe.
Hope this helps and I can offer more assistance if needed.