For many of us, crossdressing is "simply" a choice of wearing female clothing versus male clothing. But for some of us, there are other factors - beyond our control - which also come into play.
For example, I suffer from a very rare skin disease which prevents me from wearing any tight fitting clothing, especially certain man-made fabrics or elasticated items, which quickly cause chafing and inflammation.
I can well imagine that aside from my own affliction, there must be many other crossdressers out there who - for whatever reason - are hindered in their enjoyment of crossdressing due to disease, illness, or other "conditions".
Anyone?