The RCMP has been through this as well. In 1974 when the first female troops were permitted at Depot, they wore a completely different uniform with a skirt, pumps, white turtle neck and hat. Pistol and handcuffs were carried in a purse in both service and operational dress. It wasn't until 1990 that women were permitted to wear the iconic red serge, stetson, Strathcona boots and breeches.
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Currently for mess dress, all members have the option of pants or a skirt.
Even this photo is a little dated as our operational uniform has changed since, and is in the process of changing as we speak. The grey shirt is being replaced by a blue shirt that is similar to CAF OTW shirts, where the portion covered by body armour is moisture wicking fabric, and the collar and sleeves resemble a dress shirt. The shirt will come in female and male "cuts".
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In typical federal government procurement fashion, this project has taken nearly a decade between RCMP management stalling and project favoritisms (more than one dinosaur around lamenting the loss of grey shirts), PSPC limitations and the chosen contractor being unable to actually supply the shirts in quantities needed for a full rollout. So we're starting in the smallest divisions on the east coast, and the hope is that in about two years they'll have enough for the entire force.
On the plus side, we stopped trying to force the one size fits all idea on members for pants and boots, and have a BOOTFORGEN type of system where you buy your own and expense them to the Force once a supervisor checks they're actually appropriate.
Now if I could only BOOTFORGEN myself a pistol...