Take a collection of items.
You split this collection up into 3 groups and then within your UI (in this example we'll assume we're designing an iOS app) you place a segment control with 3 segments so the user can browse each sub group of items independently of the other. The user should never see the full collection at once, they should only ever see 1 of the 3 sub groups of the collection.
But what if one of the items can fit within more than one of the segments? In the example below "rain macs" appear under the "coats" segment and under the "rain macs" segment.
Is it still ok to use a segment control and have the same item appearing under both segments? see diagram below of this example.
Or is this confusing for the user as they believe they are browsing between 3 distinct groups? If so, what is the best way to browse the collection? Is a label for the segment control required e.g. "Browse by tag.. [segment control here]" or "View items tagged with.. [segment control here]". Or is a completely different approach required.