Beautiful dress, and your silhouette is spot-on! Your hair is gorgeous, too, and the low level of it is just like ones I've seen in CDVs. Another variation is to start with a couple of braids; it lets you get it a bit wider and lower, so you don't have the big central coil to work around. You can also do a crosswise part so the front hair can be done differently (rolled or waved or some such), which reduces the volume in the big knot in back. Your collar is SO GOOD. It's easy to forget, but nearly ubiquitous and makes it look so pretty. And I love the length of your skirt. Reenactors often hem them fairly short, which is handy for camping in a field, but not actually very appropriate for most situations. Yours is great!
The bonnet is pretty and completes the outfit, but it doesn't seem to fit right; I'm sorry it was annoying to wear. Depending on the design, sometimes it works to actually sit the back edge of it on your chignon. Another way to hold it on is to have a ribbon of velvet act like an interior headband. It's only attached at the lower edges of the bonnet, so it makes the bonnet "perch" just right; and the velvet catches on your hair so it won't slide back. A bonnet "stay" like this has kept a silk-lined spoon-like bonnet on my head in 20-30 mph winds.
If you want to change up the back, you can trim it into a single point; that's a lot more common and (ironically) less cookie-cutter for your situation. Big reticules are quite uncommon in the 1860s, and it's awkward to manage a big one against the hoop; what is common is big pockets! Open the seam on the right front, attach a pocket bag underneath, and tack the top of it to the skirt pleats for support (or a couple short pieces of tape). You can hide a LOT under those skirts. ;) I can link you to some better instructions if you want.
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The bonnet is pretty and completes the outfit, but it doesn't seem to fit right; I'm sorry it was annoying to wear. Depending on the design, sometimes it works to actually sit the back edge of it on your chignon. Another way to hold it on is to have a ribbon of velvet act like an interior headband. It's only attached at the lower edges of the bonnet, so it makes the bonnet "perch" just right; and the velvet catches on your hair so it won't slide back. A bonnet "stay" like this has kept a silk-lined spoon-like bonnet on my head in 20-30 mph winds.
If you want to change up the back, you can trim it into a single point; that's a lot more common and (ironically) less cookie-cutter for your situation. Big reticules are quite uncommon in the 1860s, and it's awkward to manage a big one against the hoop; what is common is big pockets! Open the seam on the right front, attach a pocket bag underneath, and tack the top of it to the skirt pleats for support (or a couple short pieces of tape). You can hide a LOT under those skirts. ;) I can link you to some better instructions if you want.