Need to be slim round the ankle for riding too!
A lot of workwear trousers like dewalt etc are quite straight-leg in their cut – mainly to accommodate knee pads – and may be a bit flappy round the ankles for cycling. The material tends to be pretty heavy gauge too and a bit slow to dry if it gets wet
A bit over your budget but the Snickers 6241 and 6341 (once version has holster pockets one doesnt) trousers are a more tapered cut than most using stretch panels in various places to keep them very well articulated (Snickers stuff tends to be much better tailored for movement than a lot of the competition) and cordura anywhere that would be vulnerable to wear and tear.
They’re over your budget but… they’ll outlast anything else you’ve been buying by a country mile, they can take a bit of enthusiastic laundering for getting rid of oil and grease (and the black ones won’t show it up anyway) so will stay presentable for longer too.
Although theres lots of people making that style of multi pocket workwear now Snickers pioneered it and while a lot of others look the same I find the pockets are really quite poorly thought out (I bought some Dewalt ones and the pockets were unusable, wore them twice and put them in the charity bag)
On the bike the cut and flexibly is very comfy and the cuffs stay out of trouble – not as weather proof as soft shell but better than normal workwear and quick to dry if you do get wet
The Snickers 6902 and 6903 aren’t as tapered, but still a fair bit less flappy than most – are made from tough stretchy ripstop fabric thats pretty windproof and very fast to dry. Again will outlast anything like softshell by years. My work is either in the workshop or halfway up a Scottish mountain somewhere and in all but the worst weather the 6903s are great outdoor wear
Snickers has a huge range of sizing too – with everything available in 3 different leg lengths where as many workwear brands tend to assume their customers are a bit stocky and the legs tend to be a bit short.
Its worth saving searches for Snickers stuff on eBay – people tend to sell on stuff they’ve been issued by work and you can pick up some bargains.