Historic patterns are wonderful to use, but often uncomfortable for modern people to wear. They tend to restrict arm movement & are very small in comparison to what we are accustomed to.
Here is how to re-size an armhole & sleeve for more comfortable modern wear, but maintain the integrity of the original pattern.
(I'm using the 1825 Dress Coat pattern from COMC).
You can use this method in pre-made patterns as well.
Add 4" -6" ease to the original armhole measurement (19 1/2"). Do not add more as it will lose the historic look.
*Working class garments had much more arm movement than leisure class... add 5-8" depending on the garment.
I want a 24 1/2" finished arm hole. This should give Brian enough room for his clothes & some arm movement.
*If someone is dancing or riding in this garment, I would add a little more in the upper sleeve.
**If this is for a theatrical event, ask the costume manager if they want a truly historic look or if they want the actors to be able to have full movement.
Once you have the correct length on the sleeve (add X" to bicep & forearm), mark your width increases according to the individual.
In this case I had to add 2 1/2", so 1 1/4" to each side of the bicep.
If the wrist is correct as it was here, and the forearm needs to be larger, make gradual changes from one area to the other.
Alternatively, you can split the sleeve down the center line & add more there.
I prefer to add onto the outside along the horizontal guidelines as that is a little more forgiving. (Guidelines are in green).
Set in your new sleeve-width measurements & lightly draw the new lines. Keep the shape of the sleeve.
(new lines are in green, old lines are in blue).
For this dress coat, I want 5" ease in the armhole,
3-4" ease in the bicep,
2-3" ease in the forearm
& 2" ease at the wrist.
Using a triangle or T-square, mark the top of the sleeve cap in both directions. This will give you a good guideline for re-adjusting the upper sleeve.
Re-draw the sleeve cap, making it meet the same place as the original cap.
Now measure again & add more by measuring up from the highest point of the sleeve cap & re-draw the lines.
I re-drew this line 4 times before I got the measurement & shape I wanted. Be patient & don't get discouraged. You may have to readjust after you have played with the under sleeve too.
Do not erase the original pattern, but if your adjustment lines get too confusing, erase them as you go.
Once your upper sleeve is "set", draw in guidelines for your under sleeve.
Guidelines should be at the lowest & highest points, and mark where the lines intersect.
Measure how many inches you increased the width, then move the lowest/highest point accordingly.
IE: if there is 1/2" difference on the left side of the lower & upper sleeve, mark 1/2" from the edge of the upper & under sleeve.
Readjust the lines for the under sleeve. If you need more inches, lower the low parts & raise the high parts, but be careful to maintain the original shape as much as possible.
The guidelines are marked in green, the original line in blue & the adjustments in red.
Measure a final time & make sure your upper sleeve & under sleeve measurements are 24 1/2" or more.
I prefer to have 1/2"-1" more for a perfectly fitted sleeve as I can account for the ease, but don't like stretching the body of the coat.
Re-draw the vertical lines to match up with the final edge of your top sleeves.
Make sure they meet up where they should (in this case it's just above the elbow).
Re-check your measurements & shapes one last time & erase any old lines.
I prefer to use colored Sharpie markers to finalize my patterns.
Add seam allowance (I like 1/2") to the outside of whatever needs it (if you are working with cut edges, do not add seam allowance).
Be sure to label all pattern pieces with the following:
Number of pieces to cut
This will make it very easy to make another garment when your returning customers say "I want another one JUST LIKE THAT ONE!" Or if you have a customer with almost the same measurements, you don't have to reinvent the wheel.
I fold up my patterns & put them in gallon plastic storage bags with the garment & customer name on the front.
I also store my patterns according to male/female & century.
All of the original adjustments were made in pencil, any colors have been added on the computer for clarification. If you have any trouble understanding the directions here, please let me know... I'm a bit low on blood sugar & it's past time for lunch.