TK Maxx, or GO Outdoors if you have one
go outdoors
TKM sometimes get Patagonia stuff which is absolutely superb, and lasts forever! ( I have thermals that are 15 years old and salopettes that are 9 year old).
I would spend money on decent base layers (long sleeved vest and long johns), and get merino wool ones if you can - super warm, lovely feel and doesn't smell! And get some decent socks, with high wool content. Don't get them so thick that you won't be able to wiggle your toes in your ski boots. If you are hiring boots, then maybe wait and get some socks in resort, once you have your boots.
Ski trews should obviously give you enough room to bend in, but don't have to be super baggy - there are lots like this but more for a fashion thing amongst "yoof".
I ski in longsleeved merino top and long johns (Howies), stretchy fleece leggings (Lowe Alpine), fleece jacket/jumper, maybe also thin fleece jumper too, goretex salopettes (unlined, Patagonia), goretex walking jacket (also unlined, also Patagonia), Buff and helmet. But I carry a decent hat for "vin chaud" breaks. And good gloves - separate shell and inner are easier to dry over night and warmer than "one piece". I wear mittens, I find them warmer than gloves. And I usually wear a pair of thin "magic gloves" as a liner.
And get some decent UV chap stick too.