The one with technical rules
Speaking on a stage
What to wear on stage: the microphone, camera and lighting constraints nobody tells first-time speakers about.
Dressing for a stage is not a style question. It is a set of technical constraints, and almost nobody is told about them before their first talk. You find out afterwards, from the video, or from the sound engineer’s face.

The constraints, and why they exist
What happens
Fine stripes or tight checks. On camera they strobe and shimmer. It is called a moiré pattern and it is a property of the sensor, not of the shirt.
What DROBE does
Note it on the item once. It stays noted. You never have to remember which shirt it was.
What happens
Pure white. Blows out under stage lighting and drags the exposure down, so your face goes dark to compensate.
What DROBE does
Off-white, light grey, or a soft colour. The item that is fine in a meeting room is not the item for a lit stage, and the two get told apart.
What happens
Nowhere to clip the lapel mic. A crew-neck dress or a soft jumper gives the sound engineer nothing. This gets discovered five minutes before you go on.
What DROBE does
A placket, a lapel, a collar or a firm neckline. It becomes part of what a stage outfit is, checked when the outfit is planned rather than in the wings.
What happens
Nowhere to put the battery pack. A belt pack needs a waistband or a pocket. A dress with neither means it gets taped to you or hung somewhere awkward.
What DROBE does
Planned as part of the outfit, not improvised. If the dress has no waistband the answer is a belt, and you brought one.
What happens
Necklaces, bangles, a lanyard. Anything that swings will hit the lapel mic. It is inaudible to you and very audible in the recording.
What DROBE does
The rule is attached to the accessory, not to your memory of the last time it happened.
What happens
Green, on a green screen. Parts of you disappear. Same for blue on a blue screen.
What DROBE does
Attached to the event: this venue keys on green, so nothing green.
What happens
Sweat. Stage lights are hot and grey and light blue show everything.
What DROBE does
Known per item. If it shows, it is not the stage shirt, and the app remembers that so you do not.
Why this belongs in a wardrobe app
Every one of these is a fact about a specific garment that you learn once and then forget by the next time you speak. They are exactly the kind of thing that should live with the item rather than in your head - the same way a care label does.