What worked for my self was the ConvaTec Esteem Synergy Two peice appliance, which consist of a self adhesive flange/base which firmly adheres to the abdomen with a colostomy bag affixed to it.
I took to using a self adhesive closed bag without filter as I found the bags with the filter created staining through my clothes.
The Esteem Synergy appliance is also available with a plastic coupling, which clicks the colostomy bag and the flange together but due to a couple of issues I experienced, I felt more comfortable and secure using the self adhesive coupling.
I decided to use a closed bag rather than a drainable one partially due to appearance; the Esteem Synergy closed bags look more attractive, they are also available in three sizes; one which is really compact and ideal when participating in action under the sheets; as it doesn't hang down or drag against the top of the thigh, especially when containing output.
When applying the flange/base over my Stoma and onto my abdomen, I also used a Salts Stoma Collar, which as the name suggest, it's a collar which creates a seal around the Stoma and prevents Stoma output from leaking under the flange/base and onto the abdomen.
I also inserted two Morform Sachets into the colostomy bag just prior to use; the Morform sachets would kinda thicken/solidify the Stoma output within the colostomy bag, which was more comfortable than what felt like a bag of liquid against my abdomen.
During my time with the Stoma, I tried all kinds of Stoma appliances from various manufacturers and the only products from ConvaTec met my needs and expectations.
I also wear high waist unisex boxer shorts from Comfizz, which are similar to a cycling short and tight fitting, especially across the lower abdomen, which keeps the colostomy bag flat and close to the body, which helps conceal it under clothing.
Although the Comfizz boxers are a snug fit, they are extremely comfortable, I guess they contain Lycra as the boxers stretch to conform with movement, in fact, they are so confortable I still wear them, although now I have a J pouch (I fold the high waist over); I also wear the Comfizz standard waist boxers too.