Got the Cadet Gray and Butternut Brown: Notes on Confederate Uniforms book from a sutler at a reenactment. It was published by Thomas Publications in Gettysburg, PA in 2006. Since you mentioned the Peter Tait jacket, I will have to humbly recommend one of the guys in my unit's book on that subject. http://adolphusconfederateuniforms.com/store.html You should also check out his page on articles, lots of great stuff.

As for DeBlanc's rank at time of picture, let's try to figure this out together. Here is Perry's service record.

Perry, Robert S., Pvt. Co. C, F. and S., 8th La. Inf. En. June 19, 1861, Camp Moore, La. Present
on Rolls to Aug., 1861. Roll Sept. and Oct, 1861, Present. Elected 2nd Lt. Jr. at Camp Pickens,
Sept. 5, 1861. Rolls Nov., 1861, to June, 1862, Present. Roll June 30, 1862, Present. Apptd.
Adjt., May 7, 1862. Rolls July, 1862, to Aug. 31, 1863, Present. Rolls Nov., 1863, to Aug. 31,
1864, Absent, prisoner of war, since Nov. 7, 1863. Federal Rolls of Prisoners of War, Captured
Rappahannock, Va., Nov. 7, 1863. Transfd. to Johnson's Island, Ohio, from Washington, D. C.,
Nov. 11, 1863. Released on Oath of Allegiance from Johnson's Island, Ohio, June 13, 1865. Res.
Abbeville, La., age 30 years, complexion light, hair dark, eyes dark, height 5 ft. 7 in., born
Louisiana, occupation lawyer, single.

And DeBlanc's service record.

De Blanc, Alcibiades.Capt. Co. C. Col. F. and S. 8th La. Infty. En. June 19th, 1861, Camp Moore,
La. Present on all Rolls to Aug., 1861. Regtl. Return for Sept., 1861, Absent, sick, at
Warrenton, since Sept. 28th, 1861. Rolls from Sept., 1861, to Aug., 1862, Present. Roll for
Sept. and Oct., 1862, Present. Promoted Major by seniority, Sept. _, 1862. Rolls from Nov.,
1862, to Feb., 1863, Present. Roll for March and April, 1863, Promoted Lt. Col. at
Fredericksburg, April 6th, 1863. Federal Rolls of Prisoners of War, Captured Banks Ford, May
4th, 1863. Paroled at Old Capitol Prison, Washington, D. C., _, 1863. Rolls from May 14th, 1863,
to Nov. 12th, 1863, Absent since July 2nd. Wounded at Gettysburg. Now in Hospl. at Lynchburg.
Apptd. Colonel, July 2nd, 1863, by President Davis. Roll for Nov. 12th to Dec. 31st, 1863.
Absent on furlough. Wounded on July 2nd, 1863, at Gettysburg, Pa. Roll for Sept. and Oct., 1864,
dated Feb. 25th, 1865, Transfd. to Invalid Corps, Aug. 15th, 1864. Record copied from Memorial Hall,
New Orleans, La., by the War Dept., Washington, D. C., May, 1903, Retired Aug., 1864, Lynchburg,
Va. Promoted. Major Oct. 15th, 1862. Promoted Lt. Col. April _, 1863. Promoted Colonel July 2nd,
1863. A perfect gentleman and an excellent officer. In Aug., 1864, retired from disabling wounds
recd. July 2nd, 1863. All respected, obeyed and loved him. Born Louisiana, occupation lawyer,
age when enlisted 41, married, Res. St. Martinville, La.

When Perry was elected 2nd Jr. Lt, he would only have had one bar on each collar. He was appointed regimental adjutant on May 7, 1862 and on duty until his capture on Nov. 7, 1863. DeBlanc was appointed lt. colonel on April 6, 1863. DeBlanc was wounded on July 2, 1863, and was appointed a colonel by President Davis but never returned to service. Neither look wounded in the photograph, so it seems to logically make sense that the photograph was taken between Perry's appointment to adjutant on May 7, 1862 and DeBlanc's wounding on July 2, 1863. So technically, DeBlanc could have been a captain, major, or lt. colonel at the time of the photograph, but not a colonel, yet. This is, of course, pure speculation and left up to your opinion.

Looking to make a short violet jacket? haha You have had me eyeballing a dark purple blanket for conversion that I have but I did not want to clash with you on the field.