Here are two examples of T-cap baby bonnets. The variations of materials that can be used in these heirloom bonnets are endless. In the following example, the bonnet is created using lace and eyelet. The longer rectangle section going from ear to ear is finished 11 3/4 inches long and 3 1/2 inches wide. To create the smaller back strip I omitted some of the lace to create a width of 2 1/2 inches. The length is 5 1/2 inches. Whatever lace is used on the outside or longer edge of the larger rectangle should also be used on the outside edge of the smaller rectangle. Hopefully, you can see the adjustments in the photos.
The next example uses a puffing strip in both rectangle pieces but the back one is a fraction more narrow. Again, the lace is adjusted to omit an inch in the width for the back rectangle. However, the same lace is used on the outside edge of both rectangle pieces.