Unidentified, Victorian fancy
In pattern BGBRGBRGBRGBRGBRGBRYRWGRRRWRRR.
This was sourced from weddslist. It is a 30 stripes tartan.
Original link http://www.weddslist.com/cgi-bin/tartans/pg.pl?source=sts
Thread count
B/12 G12 B4 LT20 G12 B4 LT20 G12 B4 LT20 G12 B4 LT20 G12 B4 LT20 G12 B11 LT24 O4 LT4 LN2 DG20 R8 LT4 R5 LN4 R5 LT4 R/8

Palette
Each colour and its ΔE from the base-6 reference it is a variant of.
| Colour | Shade | Base | ΔE (OKLab) |
|---|---|---|---|
| B | #304080 #304080 | B #2C4084 | 0.01 |
| DG | #003000 #003000 | G #006400 | 0.18 |
| G | #30A010 #30A010 | G #006400 | 0.19 |
| LN | #E0E0E0 #E0E0E0 | W #F4F4F0 | 0.06 |
| LT | #806050 #806050 | R #C80000 | 0.17 |
| O | #FF8500 #FF8500 | Y #E8C000 | 0.14 |
| R | #D03030 #D03030 | R #C80000 | 0.05 |
ID: /setts/s30/b12g12b4r20g12b4r20g12b4r20g12b4r20g12b4r20g12b11r24y4r4w2ga20ra8r4ra5w4ra5r4ra8-b304080-g30a010-ga003000-r806050-rad03030-we0e0e0-yff8500/