I really like Unfancy.
I don't do a capsule wardrobe, but I do find myself dressing in a bit of a uniform, or several uniforms.
For casual, this generally means black or blue skinnies, Converse, ankle boots or sandals according to the weather, and a top which is generally black, white or grey. Add a cotton cardigan, denim jacket, jersey jacket, biker or parka according to the weather. This can turn into evening wear by having heeled sandals or boots, and the top in a silkier fabric, or with a bit of detailing. Sometimes the skinny jeans are replaced with a tube skirt, with or without tights.
For work, generally a jersey dress or pencil/tube skirt, plain top, jacket.
Another look that I wear a lot is a plain fitted-ish top with a full midi-ish skirt.
What I like doing is sorting out my wardrobe every couple of months. I'm pretty ruthless about culling, but I also move things around and wear a 'cluster' of items for a few weeks. So, for the first few weeks of Autumn this year, it might look a bit like this for casual:
Jeans - 2 black, 2 blue (one light wash, one mid wash)
Tops - grey (several), white, black (several), burgundy, pink
Jumpers - black cotton, black cashmere, black turtleneck, grey lacy knit
Cardigans - black, grey
Skirts - midi tube, mini tube, printed full skirt x 2
Shoes - 2 Converse (black, red), boots (flat black, flat red, heeled black, heeled grey)
Coats - grey fabric biker, black biker, grey biker, parka
Scarves - lots!